summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--doc/guix.texi1371
-rw-r--r--gnu-system.am1
-rw-r--r--gnu/services/mail.scm1692
3 files changed, 3064 insertions, 0 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index f63e3669fa..06d70ba8a4 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -181,6 +181,7 @@ Services
* X Window:: Graphical display.
* Desktop Services:: D-Bus and desktop services.
* Database Services:: SQL databases.
+* Mail Services:: IMAP, POP3, SMTP, and all that.
* Web Services:: Web servers.
* Various Services:: Other services.
@@ -6377,6 +6378,7 @@ declaration.
* X Window:: Graphical display.
* Desktop Services:: D-Bus and desktop services.
* Database Services:: SQL databases.
+* Mail Services:: IMAP, POP3, SMTP, and all that.
* Web Services:: Web servers.
* Various Services:: Other services.
@end menu
@@ -7100,6 +7102,1375 @@ The PostgreSQL daemon loads its runtime configuration from
@var{data-directory}.
@end deffn
+@node Mail Services
+@subsubsection Mail Services
+
+The @code{(gnu services mail)} module provides Guix service definitions
+for mail services. Currently the only implemented service is Dovecot,
+an IMAP, POP3, and LMTP server.
+
+Guix does not yet have a mail transfer agent (MTA), although for some
+lightweight purposes the @code{esmtp} relay-only MTA may suffice. Help
+is needed to properly integrate a full MTA, such as Postfix. Patches
+welcome!
+
+To add an IMAP/POP3 server to a GuixSD system, add a
+@code{dovecot-service} to the operating system definition:
+
+@deffn {Scheme Procedure} dovecot-service [#:config (dovecot-configuration)]
+Return a service that runs the Dovecot IMAP/POP3/LMTP mail server.
+@end deffn
+
+By default, Dovecot doesn't need much configuration; the default
+configuration object created by @code{(dovecot-configuration)} will
+suffice if your mail is delivered to @code{~/Maildir}. A self-signed
+certificate will be generated for TLS-protected connections, though
+Dovecot will also listen on cleartext ports by default. There are a
+number of options though which mail administrators might need to change,
+and as is the case with other services, Guix allows the system
+administrator to specify these parameters via a uniform Scheme interface.
+
+For example, to specify that mail is located at @code{maildir~/.mail},
+one would instantiate the Dovecot service like this:
+
+@example
+(dovecot-service #:config
+ (dovecot-configuration
+ (mail-location "maildir:~/.mail")))
+@end example
+
+The available configuration parameters follow. Each parameter
+definition is preceded by its type; for example, @samp{string-list foo}
+indicates that the @code{foo} parameter should be specified as a list of
+strings. There is also a way to specify the configuration as a string,
+if you have an old @code{dovecot.conf} file that you want to port over
+from some other system; see the end for more details.
+
+@c The following documentation was initially generated by
+@c (generate-documentation) in (gnu services mail). Manually maintained
+@c documentation is better, so we shouldn't hesitate to edit below as
+@c needed. However if the change you want to make to this documentation
+@c can be done in an automated way, it's probably easier to change
+@c (generate-documentation) than to make it below and have to deal with
+@c the churn as dovecot updates.
+
+Available @code{dovecot-configuration} fields are:
+
+@deftypevr {@code{dovecot-configuration} parameter} package dovecot
+The dovecot package.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} comma-separated-string-list listen
+A list of IPs or hosts where to listen in for connections. @samp{*}
+listens in all IPv4 interfaces, @samp{::} listens in all IPv6
+interfaces. If you want to specify non-default ports or anything more
+complex, customize the address and port fields of the
+@samp{inet-listener} of the specific services you are interested in.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} protocol-configuration-list protocols
+List of protocols we want to serve. Available protocols include
+@samp{imap}, @samp{pop3}, and @samp{lmtp}.
+
+Available @code{protocol-configuration} fields are:
+
+@deftypevr {@code{protocol-configuration} parameter} string name
+The name of the protocol.
+@end deftypevr
+
+@deftypevr {@code{protocol-configuration} parameter} string auth-socket-path
+UNIX socket path to master authentication server to find users.
+This is used by imap (for shared users) and lda.
+Defaults to @samp{"/var/run/dovecot/auth-userdb"}.
+@end deftypevr
+
+@deftypevr {@code{protocol-configuration} parameter} space-separated-string-list mail-plugins
+Space separated list of plugins to load.
+@end deftypevr
+
+@deftypevr {@code{protocol-configuration} parameter} non-negative-integer mail-max-userip-connections
+Maximum number of IMAP connections allowed for a user from each IP
+address. NOTE: The username is compared case-sensitively.
+Defaults to @samp{10}.
+@end deftypevr
+
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} service-configuration-list services
+List of services to enable. Available services include @samp{imap},
+@samp{imap-login}, @samp{pop3}, @samp{pop3-login}, @samp{auth}, and
+@samp{lmtp}.
+
+Available @code{service-configuration} fields are:
+
+@deftypevr {@code{service-configuration} parameter} string kind
+The service kind. Valid values include @code{director},
+@code{imap-login}, @code{pop3-login}, @code{lmtp}, @code{imap},
+@code{pop3}, @code{auth}, @code{auth-worker}, @code{dict},
+@code{tcpwrap}, @code{quota-warning}, or anything else.
+@end deftypevr
+
+@deftypevr {@code{service-configuration} parameter} listener-configuration-list listeners
+Listeners for the service. A listener is either an
+@code{unix-listener-configuration}, a @code{fifo-listener-configuration}, or
+an @code{inet-listener-configuration}.
+Defaults to @samp{()}.
+
+Available @code{unix-listener-configuration} fields are:
+
+@deftypevr {@code{unix-listener-configuration} parameter} file-name path
+The file name on which to listen.
+@end deftypevr
+
+@deftypevr {@code{unix-listener-configuration} parameter} string mode
+The access mode for the socket.
+Defaults to @samp{"0600"}.
+@end deftypevr
+
+@deftypevr {@code{unix-listener-configuration} parameter} string user
+The user to own the the socket.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{unix-listener-configuration} parameter} string group
+The group to own the socket.
+Defaults to @samp{""}.
+@end deftypevr
+
+
+Available @code{fifo-listener-configuration} fields are:
+
+@deftypevr {@code{fifo-listener-configuration} parameter} file-name path
+The file name on which to listen.
+@end deftypevr
+
+@deftypevr {@code{fifo-listener-configuration} parameter} string mode
+The access mode for the socket.
+Defaults to @samp{"0600"}.
+@end deftypevr
+
+@deftypevr {@code{fifo-listener-configuration} parameter} string user
+The user to own the the socket.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{fifo-listener-configuration} parameter} string group
+The group to own the socket.
+Defaults to @samp{""}.
+@end deftypevr
+
+
+Available @code{inet-listener-configuration} fields are:
+
+@deftypevr {@code{inet-listener-configuration} parameter} string protocol
+The protocol to listen for.
+@end deftypevr
+
+@deftypevr {@code{inet-listener-configuration} parameter} string address
+The address on which to listen, or empty for all addresses.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{inet-listener-configuration} parameter} non-negative-integer port
+The port on which to listen.
+@end deftypevr
+
+@deftypevr {@code{inet-listener-configuration} parameter} boolean ssl?
+Whether to use SSL for this service; @samp{yes}, @samp{no}, or
+@samp{required}.
+Defaults to @samp{#t}.
+@end deftypevr
+
+@end deftypevr
+
+@deftypevr {@code{service-configuration} parameter} non-negative-integer service-count
+Number of connections to handle before starting a new process.
+Typically the only useful values are 0 (unlimited) or 1. 1 is more
+secure, but 0 is faster. <doc/wiki/LoginProcess.txt>.
+Defaults to @samp{1}.
+@end deftypevr
+
+@deftypevr {@code{service-configuration} parameter} non-negative-integer process-min-avail
+Number of processes to always keep waiting for more connections.
+Defaults to @samp{0}.
+@end deftypevr
+
+@deftypevr {@code{service-configuration} parameter} non-negative-integer vsz-limit
+If you set @samp{service-count 0}, you probably need to grow
+this.
+Defaults to @samp{256000000}.
+@end deftypevr
+
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} dict-configuration dict
+Dict configuration, as created by the @code{dict-configuration}
+constructor.
+
+Available @code{dict-configuration} fields are:
+
+@deftypevr {@code{dict-configuration} parameter} free-form-fields entries
+A list of key-value pairs that this dict should hold.
+Defaults to @samp{()}.
+@end deftypevr
+
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} passdb-configuration-list passdbs
+List of passdb configurations, each one created by the
+@code{passdb-configuration} constructor.
+
+Available @code{passdb-configuration} fields are:
+
+@deftypevr {@code{passdb-configuration} parameter} string driver
+The driver that the passdb should use. Valid values include
+@samp{pam}, @samp{passwd}, @samp{shadow}, @samp{bsdauth}, and
+@samp{static}.
+Defaults to @samp{"pam"}.
+@end deftypevr
+
+@deftypevr {@code{passdb-configuration} parameter} free-form-args args
+A list of key-value args to the passdb driver.
+Defaults to @samp{()}.
+@end deftypevr
+
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} userdb-configuration-list userdbs
+List of userdb configurations, each one created by the
+@code{userdb-configuration} constructor.
+
+Available @code{userdb-configuration} fields are:
+
+@deftypevr {@code{userdb-configuration} parameter} string driver
+The driver that the userdb should use. Valid values include
+@samp{passwd} and @samp{static}.
+Defaults to @samp{"passwd"}.
+@end deftypevr
+
+@deftypevr {@code{userdb-configuration} parameter} free-form-args args
+A list of key-value args to the userdb driver.
+Defaults to @samp{()}.
+@end deftypevr
+
+@deftypevr {@code{userdb-configuration} parameter} free-form-args override-fields
+Override fields from passwd.
+Defaults to @samp{()}.
+@end deftypevr
+
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} plugin-configuration plugin-configuration
+Plug-in configuration, created by the @code{plugin-configuration}
+constructor.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} list-of-namespace-configuration namespaces
+List of namespaces. Each item in the list is created by the
+@code{namespace-configuration} constructor.
+
+Available @code{namespace-configuration} fields are:
+
+@deftypevr {@code{namespace-configuration} parameter} string name
+Name for this namespace.
+@end deftypevr
+
+@deftypevr {@code{namespace-configuration} parameter} string type
+Namespace type: @samp{private}, @samp{shared} or @samp{public}.
+Defaults to @samp{"private"}.
+@end deftypevr
+
+@deftypevr {@code{namespace-configuration} parameter} string separator
+Hierarchy separator to use. You should use the same separator for
+all namespaces or some clients get confused. @samp{/} is usually a good
+one. The default however depends on the underlying mail storage
+format.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{namespace-configuration} parameter} string prefix
+Prefix required to access this namespace. This needs to be
+different for all namespaces. For example @samp{Public/}.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{namespace-configuration} parameter} string location
+Physical location of the mailbox. This is in same format as
+mail_location, which is also the default for it.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{namespace-configuration} parameter} boolean inbox?
+There can be only one INBOX, and this setting defines which
+namespace has it.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{namespace-configuration} parameter} boolean hidden?
+If namespace is hidden, it's not advertised to clients via NAMESPACE
+extension. You'll most likely also want to set @samp{list? #f}. This is mostly
+useful when converting from another server with different namespaces
+which you want to deprecate but still keep working. For example you can
+create hidden namespaces with prefixes @samp{~/mail/}, @samp{~%u/mail/}
+and @samp{mail/}.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{namespace-configuration} parameter} boolean list?
+Show the mailboxes under this namespace with LIST command. This
+makes the namespace visible for clients that don't support NAMESPACE
+extension. The special @code{children} value lists child mailboxes, but
+hides the namespace prefix.
+Defaults to @samp{#t}.
+@end deftypevr
+
+@deftypevr {@code{namespace-configuration} parameter} boolean subscriptions?
+Namespace handles its own subscriptions. If set to @code{#f}, the
+parent namespace handles them. The empty prefix should always have this
+as @code{#t}.)
+Defaults to @samp{#t}.
+@end deftypevr
+
+@deftypevr {@code{namespace-configuration} parameter} mailbox-configuration-list mailboxes
+List of predefined mailboxes in this namespace.
+Defaults to @samp{()}.
+
+Available @code{mailbox-configuration} fields are:
+
+@deftypevr {@code{mailbox-configuration} parameter} string name
+Name for this mailbox.
+@end deftypevr
+
+@deftypevr {@code{mailbox-configuration} parameter} string auto
+@samp{create} will automatically create this mailbox.
+@samp{subscribe} will both create and subscribe to the mailbox.
+Defaults to @samp{"no"}.
+@end deftypevr
+
+@deftypevr {@code{mailbox-configuration} parameter} space-separated-string-list special-use
+List of IMAP @code{SPECIAL-USE} attributes as specified by RFC 6154.
+Valid values are @code{\All}, @code{\Archive}, @code{\Drafts},
+@code{\Flagged}, @code{\Junk}, @code{\Sent}, and @code{\Trash}.
+Defaults to @samp{()}.
+@end deftypevr
+
+@end deftypevr
+
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} file-name base-dir
+Base directory where to store runtime data.
+Defaults to @samp{"/var/run/dovecot/"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string login-greeting
+Greeting message for clients.
+Defaults to @samp{"Dovecot ready."}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list login-trusted-networks
+List of trusted network ranges. Connections from these IPs are
+allowed to override their IP addresses and ports (for logging and for
+authentication checks). @samp{disable-plaintext-auth} is also ignored
+for these networks. Typically you'd specify your IMAP proxy servers
+here.
+Defaults to @samp{()}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list login-access-sockets
+List of login access check sockets (e.g. tcpwrap).
+Defaults to @samp{()}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean verbose-proctitle?
+Show more verbose process titles (in ps). Currently shows user name
+and IP address. Useful for seeing who are actually using the IMAP
+processes (e.g. shared mailboxes or if same uid is used for multiple
+accounts).
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean shutdown-clients?
+Should all processes be killed when Dovecot master process shuts down.
+Setting this to @code{#f} means that Dovecot can be upgraded without
+forcing existing client connections to close (although that could also
+be a problem if the upgrade is e.g. because of a security fix).
+Defaults to @samp{#t}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer doveadm-worker-count
+If non-zero, run mail commands via this many connections to doveadm
+server, instead of running them directly in the same process.
+Defaults to @samp{0}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string doveadm-socket-path
+UNIX socket or host:port used for connecting to doveadm server.
+Defaults to @samp{"doveadm-server"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list import-environment
+List of environment variables that are preserved on Dovecot startup
+and passed down to all of its child processes. You can also give
+key=value pairs to always set specific settings.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean disable-plaintext-auth?
+Disable LOGIN command and all other plaintext authentications unless
+SSL/TLS is used (LOGINDISABLED capability). Note that if the remote IP
+matches the local IP (i.e. you're connecting from the same computer),
+the connection is considered secure and plaintext authentication is
+allowed. See also ssl=required setting.
+Defaults to @samp{#t}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer auth-cache-size
+Authentication cache size (e.g. @samp{#e10e6}). 0 means it's disabled.
+Note that bsdauth, PAM and vpopmail require @samp{cache-key} to be set
+for caching to be used.
+Defaults to @samp{0}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string auth-cache-ttl
+Time to live for cached data. After TTL expires the cached record
+is no longer used, *except* if the main database lookup returns internal
+failure. We also try to handle password changes automatically: If
+user's previous authentication was successful, but this one wasn't, the
+cache isn't used. For now this works only with plaintext
+authentication.
+Defaults to @samp{"1 hour"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string auth-cache-negative-ttl
+TTL for negative hits (user not found, password mismatch).
+0 disables caching them completely.
+Defaults to @samp{"1 hour"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list auth-realms
+List of realms for SASL authentication mechanisms that need them.
+You can leave it empty if you don't want to support multiple realms.
+Many clients simply use the first one listed here, so keep the default
+realm first.
+Defaults to @samp{()}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string auth-default-realm
+Default realm/domain to use if none was specified. This is used for
+both SASL realms and appending @@domain to username in plaintext
+logins.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string auth-username-chars
+List of allowed characters in username. If the user-given username
+contains a character not listed in here, the login automatically fails.
+This is just an extra check to make sure user can't exploit any
+potential quote escaping vulnerabilities with SQL/LDAP databases. If
+you want to allow all characters, set this value to empty.
+Defaults to @samp{"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@@"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string auth-username-translation
+Username character translations before it's looked up from
+databases. The value contains series of from -> to characters. For
+example @samp{#@@/@@} means that @samp{#} and @samp{/} characters are
+translated to @samp{@@}.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string auth-username-format
+Username formatting before it's looked up from databases. You can
+use the standard variables here, e.g. %Lu would lowercase the username,
+%n would drop away the domain if it was given, or @samp{%n-AT-%d} would
+change the @samp{@@} into @samp{-AT-}. This translation is done after
+@samp{auth-username-translation} changes.
+Defaults to @samp{"%Lu"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string auth-master-user-separator
+If you want to allow master users to log in by specifying the master
+username within the normal username string (i.e. not using SASL
+mechanism's support for it), you can specify the separator character
+here. The format is then <username><separator><master username>.
+UW-IMAP uses @samp{*} as the separator, so that could be a good
+choice.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string auth-anonymous-username
+Username to use for users logging in with ANONYMOUS SASL
+mechanism.
+Defaults to @samp{"anonymous"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer auth-worker-max-count
+Maximum number of dovecot-auth worker processes. They're used to
+execute blocking passdb and userdb queries (e.g. MySQL and PAM).
+They're automatically created and destroyed as needed.
+Defaults to @samp{30}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string auth-gssapi-hostname
+Host name to use in GSSAPI principal names. The default is to use
+the name returned by gethostname(). Use @samp{$ALL} (with quotes) to
+allow all keytab entries.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string auth-krb5-keytab
+Kerberos keytab to use for the GSSAPI mechanism. Will use the
+system default (usually /etc/krb5.keytab) if not specified. You may
+need to change the auth service to run as root to be able to read this
+file.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean auth-use-winbind?
+Do NTLM and GSS-SPNEGO authentication using Samba's winbind daemon
+and @samp{ntlm-auth} helper.
+<doc/wiki/Authentication/Mechanisms/Winbind.txt>.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} file-name auth-winbind-helper-path
+Path for Samba's @samp{ntlm-auth} helper binary.
+Defaults to @samp{"/usr/bin/ntlm_auth"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string auth-failure-delay
+Time to delay before replying to failed authentications.
+Defaults to @samp{"2 secs"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean auth-ssl-require-client-cert?
+Require a valid SSL client certificate or the authentication
+fails.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean auth-ssl-username-from-cert?
+Take the username from client's SSL certificate, using
+@code{X509_NAME_get_text_by_NID()} which returns the subject's DN's
+CommonName.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list auth-mechanisms
+List of wanted authentication mechanisms. Supported mechanisms are:
+@samp{plain}, @samp{login}, @samp{digest-md5}, @samp{cram-md5},
+@samp{ntlm}, @samp{rpa}, @samp{apop}, @samp{anonymous}, @samp{gssapi},
+@samp{otp}, @samp{skey}, and @samp{gss-spnego}. NOTE: See also
+@samp{disable-plaintext-auth} setting.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list director-servers
+List of IPs or hostnames to all director servers, including ourself.
+Ports can be specified as ip:port. The default port is the same as what
+director service's @samp{inet-listener} is using.
+Defaults to @samp{()}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list director-mail-servers
+List of IPs or hostnames to all backend mail servers. Ranges are
+allowed too, like 10.0.0.10-10.0.0.30.
+Defaults to @samp{()}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string director-user-expire
+How long to redirect users to a specific server after it no longer
+has any connections.
+Defaults to @samp{"15 min"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer director-doveadm-port
+TCP/IP port that accepts doveadm connections (instead of director
+connections) If you enable this, you'll also need to add
+@samp{inet-listener} for the port.
+Defaults to @samp{0}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string director-username-hash
+How the username is translated before being hashed. Useful values
+include %Ln if user can log in with or without @@domain, %Ld if mailboxes
+are shared within domain.
+Defaults to @samp{"%Lu"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string log-path
+Log file to use for error messages. @samp{syslog} logs to syslog,
+@samp{/dev/stderr} logs to stderr.
+Defaults to @samp{"syslog"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string info-log-path
+Log file to use for informational messages. Defaults to
+@samp{log-path}.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string debug-log-path
+Log file to use for debug messages. Defaults to
+@samp{info-log-path}.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string syslog-facility
+Syslog facility to use if you're logging to syslog. Usually if you
+don't want to use @samp{mail}, you'll use local0..local7. Also other
+standard facilities are supported.
+Defaults to @samp{"mail"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean auth-verbose?
+Log unsuccessful authentication attempts and the reasons why they
+failed.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean auth-verbose-passwords?
+In case of password mismatches, log the attempted password. Valid
+values are no, plain and sha1. sha1 can be useful for detecting brute
+force password attempts vs. user simply trying the same password over
+and over again. You can also truncate the value to n chars by appending
+":n" (e.g. sha1:6).
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean auth-debug?
+Even more verbose logging for debugging purposes. Shows for example
+SQL queries.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean auth-debug-passwords?
+In case of password mismatches, log the passwords and used scheme so
+the problem can be debugged. Enabling this also enables
+@samp{auth-debug}.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean mail-debug?
+Enable mail process debugging. This can help you figure out why
+Dovecot isn't finding your mails.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean verbose-ssl?
+Show protocol level SSL errors.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string log-timestamp
+Prefix for each line written to log file. % codes are in
+strftime(3) format.
+Defaults to @samp{"\"%b %d %H:%M:%S \""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list login-log-format-elements
+List of elements we want to log. The elements which have a
+non-empty variable value are joined together to form a comma-separated
+string.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string login-log-format
+Login log format. %s contains @samp{login-log-format-elements}
+string, %$ contains the data we want to log.
+Defaults to @samp{"%$: %s"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mail-log-prefix
+Log prefix for mail processes. See doc/wiki/Variables.txt for list
+of possible variables you can use.
+Defaults to @samp{"\"%s(%u): \""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string deliver-log-format
+Format to use for logging mail deliveries. You can use variables:
+@table @code
+@item %$
+Delivery status message (e.g. @samp{saved to INBOX})
+@item %m
+Message-ID
+@item %s
+Subject
+@item %f
+From address
+@item %p
+Physical size
+@item %w
+Virtual size.
+@end table
+Defaults to @samp{"msgid=%m: %$"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mail-location
+Location for users' mailboxes. The default is empty, which means
+that Dovecot tries to find the mailboxes automatically. This won't work
+if the user doesn't yet have any mail, so you should explicitly tell
+Dovecot the full location.
+
+If you're using mbox, giving a path to the INBOX
+file (e.g. /var/mail/%u) isn't enough. You'll also need to tell Dovecot
+where the other mailboxes are kept. This is called the "root mail
+directory", and it must be the first path given in the
+@samp{mail-location} setting.
+
+There are a few special variables you can use, eg.:
+
+@table @samp
+@item %u
+username
+@item %n
+user part in user@@domain, same as %u if there's no domain
+@item %d
+domain part in user@@domain, empty if there's no domain
+@item %h
+home director
+@end table
+
+See doc/wiki/Variables.txt for full list. Some examples:
+@table @samp
+@item maildir:~/Maildir
+@item mbox:~/mail:INBOX=/var/mail/%u
+@item mbox:/var/mail/%d/%1n/%n:INDEX=/var/indexes/%d/%1n/%
+@end table
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mail-uid
+System user and group used to access mails. If you use multiple,
+userdb can override these by returning uid or gid fields. You can use
+either numbers or names. <doc/wiki/UserIds.txt>.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mail-gid
+
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mail-privileged-group
+Group to enable temporarily for privileged operations. Currently
+this is used only with INBOX when either its initial creation or
+dotlocking fails. Typically this is set to "mail" to give access to
+/var/mail.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mail-access-groups
+Grant access to these supplementary groups for mail processes.
+Typically these are used to set up access to shared mailboxes. Note
+that it may be dangerous to set these if users can create
+symlinks (e.g. if "mail" group is set here, ln -s /var/mail ~/mail/var
+could allow a user to delete others' mailboxes, or ln -s
+/secret/shared/box ~/mail/mybox would allow reading it).
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean mail-full-filesystem-access?
+Allow full filesystem access to clients. There's no access checks
+other than what the operating system does for the active UID/GID. It
+works with both maildir and mboxes, allowing you to prefix mailboxes
+names with e.g. /path/ or ~user/.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean mmap-disable?
+Don't use mmap() at all. This is required if you store indexes to
+shared filesystems (NFS or clustered filesystem).
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean dotlock-use-excl?
+Rely on @samp{O_EXCL} to work when creating dotlock files. NFS
+supports @samp{O_EXCL} since version 3, so this should be safe to use
+nowadays by default.
+Defaults to @samp{#t}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mail-fsync
+When to use fsync() or fdatasync() calls:
+@table @code
+@item optimized
+Whenever necessary to avoid losing important data
+@item always
+Useful with e.g. NFS when write()s are delayed
+@item never
+Never use it (best performance, but crashes can lose data).
+@end table
+Defaults to @samp{"optimized"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean mail-nfs-storage?
+Mail storage exists in NFS. Set this to yes to make Dovecot flush
+NFS caches whenever needed. If you're using only a single mail server
+this isn't needed.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean mail-nfs-index?
+Mail index files also exist in NFS. Setting this to yes requires
+@samp{mmap-disable? #t} and @samp{fsync-disable? #f}.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string lock-method
+Locking method for index files. Alternatives are fcntl, flock and
+dotlock. Dotlocking uses some tricks which may create more disk I/O
+than other locking methods. NFS users: flock doesn't work, remember to
+change @samp{mmap-disable}.
+Defaults to @samp{"fcntl"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} file-name mail-temp-dir
+Directory in which LDA/LMTP temporarily stores incoming mails >128
+kB.
+Defaults to @samp{"/tmp"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer first-valid-uid
+Valid UID range for users. This is mostly to make sure that users can't
+log in as daemons or other system users. Note that denying root logins is
+hardcoded to dovecot binary and can't be done even if @samp{first-valid-uid}
+is set to 0.
+Defaults to @samp{500}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer last-valid-uid
+
+Defaults to @samp{0}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer first-valid-gid
+Valid GID range for users. Users having non-valid GID as primary group ID
+aren't allowed to log in. If user belongs to supplementary groups with
+non-valid GIDs, those groups are not set.
+Defaults to @samp{1}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer last-valid-gid
+
+Defaults to @samp{0}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer mail-max-keyword-length
+Maximum allowed length for mail keyword name. It's only forced when
+trying to create new keywords.
+Defaults to @samp{50}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} colon-separated-file-name-list valid-chroot-dirs
+List of directories under which chrooting is allowed for mail
+processes (i.e. /var/mail will allow chrooting to /var/mail/foo/bar
+too). This setting doesn't affect @samp{login-chroot}
+@samp{mail-chroot} or auth chroot settings. If this setting is empty,
+"/./" in home dirs are ignored. WARNING: Never add directories here
+which local users can modify, that may lead to root exploit. Usually
+this should be done only if you don't allow shell access for users.
+<doc/wiki/Chrooting.txt>.
+Defaults to @samp{()}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mail-chroot
+Default chroot directory for mail processes. This can be overridden
+for specific users in user database by giving /./ in user's home
+directory (e.g. /home/./user chroots into /home). Note that usually
+there is no real need to do chrooting, Dovecot doesn't allow users to
+access files outside their mail directory anyway. If your home
+directories are prefixed with the chroot directory, append "/." to
+@samp{mail-chroot}. <doc/wiki/Chrooting.txt>.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} file-name auth-socket-path
+UNIX socket path to master authentication server to find users.
+This is used by imap (for shared users) and lda.
+Defaults to @samp{"/var/run/dovecot/auth-userdb"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} file-name mail-plugin-dir
+Directory where to look up mail plugins.
+Defaults to @samp{"/usr/lib/dovecot"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list mail-plugins
+List of plugins to load for all services. Plugins specific to IMAP,
+LDA, etc. are added to this list in their own .conf files.
+Defaults to @samp{()}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer mail-cache-min-mail-count
+The minimum number of mails in a mailbox before updates are done to
+cache file. This allows optimizing Dovecot's behavior to do less disk
+writes at the cost of more disk reads.
+Defaults to @samp{0}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mailbox-idle-check-interval
+When IDLE command is running, mailbox is checked once in a while to
+see if there are any new mails or other changes. This setting defines
+the minimum time to wait between those checks. Dovecot can also use
+dnotify, inotify and kqueue to find out immediately when changes
+occur.
+Defaults to @samp{"30 secs"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean mail-save-crlf?
+Save mails with CR+LF instead of plain LF. This makes sending those
+mails take less CPU, especially with sendfile() syscall with Linux and
+FreeBSD. But it also creates a bit more disk I/O which may just make it
+slower. Also note that if other software reads the mboxes/maildirs,
+they may handle the extra CRs wrong and cause problems.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean maildir-stat-dirs?
+By default LIST command returns all entries in maildir beginning
+with a dot. Enabling this option makes Dovecot return only entries
+which are directories. This is done by stat()ing each entry, so it
+causes more disk I/O.
+ (For systems setting struct @samp{dirent->d_type} this check is free
+and it's done always regardless of this setting).
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean maildir-copy-with-hardlinks?
+When copying a message, do it with hard links whenever possible.
+This makes the performance much better, and it's unlikely to have any
+side effects.
+Defaults to @samp{#t}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean maildir-very-dirty-syncs?
+Assume Dovecot is the only MUA accessing Maildir: Scan cur/
+directory only when its mtime changes unexpectedly or when we can't find
+the mail otherwise.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list mbox-read-locks
+Which locking methods to use for locking mbox. There are four
+available:
+
+@table @code
+@item dotlock
+Create <mailbox>.lock file. This is the oldest and most NFS-safe
+solution. If you want to use /var/mail/ like directory, the users will
+need write access to that directory.
+@item dotlock-try
+Same as dotlock, but if it fails because of permissions or because there
+isn't enough disk space, just skip it.
+@item fcntl
+Use this if possible. Works with NFS too if lockd is used.
+@item flock
+May not exist in all systems. Doesn't work with NFS.
+@item lockf
+May not exist in all systems. Doesn't work with NFS.
+@end table
+
+You can use multiple locking methods; if you do the order they're declared
+in is important to avoid deadlocks if other MTAs/MUAs are using multiple
+locking methods as well. Some operating systems don't allow using some of
+them simultaneously.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list mbox-write-locks
+
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mbox-lock-timeout
+Maximum time to wait for lock (all of them) before aborting.
+Defaults to @samp{"5 mins"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mbox-dotlock-change-timeout
+If dotlock exists but the mailbox isn't modified in any way,
+override the lock file after this much time.
+Defaults to @samp{"2 mins"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean mbox-dirty-syncs?
+When mbox changes unexpectedly we have to fully read it to find out
+what changed. If the mbox is large this can take a long time. Since
+the change is usually just a newly appended mail, it'd be faster to
+simply read the new mails. If this setting is enabled, Dovecot does
+this but still safely fallbacks to re-reading the whole mbox file
+whenever something in mbox isn't how it's expected to be. The only real
+downside to this setting is that if some other MUA changes message
+flags, Dovecot doesn't notice it immediately. Note that a full sync is
+done with SELECT, EXAMINE, EXPUNGE and CHECK commands.
+Defaults to @samp{#t}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean mbox-very-dirty-syncs?
+Like @samp{mbox-dirty-syncs}, but don't do full syncs even with SELECT,
+EXAMINE, EXPUNGE or CHECK commands. If this is set,
+@samp{mbox-dirty-syncs} is ignored.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean mbox-lazy-writes?
+Delay writing mbox headers until doing a full write sync (EXPUNGE
+and CHECK commands and when closing the mailbox). This is especially
+useful for POP3 where clients often delete all mails. The downside is
+that our changes aren't immediately visible to other MUAs.
+Defaults to @samp{#t}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer mbox-min-index-size
+If mbox size is smaller than this (e.g. 100k), don't write index
+files. If an index file already exists it's still read, just not
+updated.
+Defaults to @samp{0}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer mdbox-rotate-size
+Maximum dbox file size until it's rotated.
+Defaults to @samp{2000000}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mdbox-rotate-interval
+Maximum dbox file age until it's rotated. Typically in days. Day
+begins from midnight, so 1d = today, 2d = yesterday, etc. 0 = check
+disabled.
+Defaults to @samp{"1d"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean mdbox-preallocate-space?
+When creating new mdbox files, immediately preallocate their size to
+@samp{mdbox-rotate-size}. This setting currently works only in Linux
+with some filesystems (ext4, xfs).
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mail-attachment-dir
+sdbox and mdbox support saving mail attachments to external files,
+which also allows single instance storage for them. Other backends
+don't support this for now.
+
+WARNING: This feature hasn't been tested much yet. Use at your own risk.
+
+Directory root where to store mail attachments. Disabled, if empty.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer mail-attachment-min-size
+Attachments smaller than this aren't saved externally. It's also
+possible to write a plugin to disable saving specific attachments
+externally.
+Defaults to @samp{128000}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mail-attachment-fs
+Filesystem backend to use for saving attachments:
+@table @code
+@item posix
+No SiS done by Dovecot (but this might help FS's own deduplication)
+@item sis posix
+SiS with immediate byte-by-byte comparison during saving
+@item sis-queue posix
+SiS with delayed comparison and deduplication.
+@end table
+Defaults to @samp{"sis posix"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string mail-attachment-hash
+Hash format to use in attachment filenames. You can add any text and
+variables: @code{%@{md4@}}, @code{%@{md5@}}, @code{%@{sha1@}},
+@code{%@{sha256@}}, @code{%@{sha512@}}, @code{%@{size@}}. Variables can be
+truncated, e.g. @code{%@{sha256:80@}} returns only first 80 bits.
+Defaults to @samp{"%@{sha1@}"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer default-process-limit
+
+Defaults to @samp{100}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer default-client-limit
+
+Defaults to @samp{1000}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer default-vsz-limit
+Default VSZ (virtual memory size) limit for service processes.
+This is mainly intended to catch and kill processes that leak memory
+before they eat up everything.
+Defaults to @samp{256000000}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string default-login-user
+Login user is internally used by login processes. This is the most
+untrusted user in Dovecot system. It shouldn't have access to anything
+at all.
+Defaults to @samp{"dovenull"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string default-internal-user
+Internal user is used by unprivileged processes. It should be
+separate from login user, so that login processes can't disturb other
+processes.
+Defaults to @samp{"dovecot"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string ssl?
+SSL/TLS support: yes, no, required. <doc/wiki/SSL.txt>.
+Defaults to @samp{"required"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string ssl-cert
+PEM encoded X.509 SSL/TLS certificate (public key).
+Defaults to @samp{"</etc/dovecot/default.pem"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string ssl-key
+PEM encoded SSL/TLS private key. The key is opened before
+dropping root privileges, so keep the key file unreadable by anyone but
+root.
+Defaults to @samp{"</etc/dovecot/private/default.pem"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string ssl-key-password
+If key file is password protected, give the password here.
+Alternatively give it when starting dovecot with -p parameter. Since
+this file is often world-readable, you may want to place this setting
+instead to a different.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string ssl-ca
+PEM encoded trusted certificate authority. Set this only if you
+intend to use @samp{ssl-verify-client-cert? #t}. The file should
+contain the CA certificate(s) followed by the matching
+CRL(s). (e.g. @samp{ssl-ca </etc/ssl/certs/ca.pem}).
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean ssl-require-crl?
+Require that CRL check succeeds for client certificates.
+Defaults to @samp{#t}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean ssl-verify-client-cert?
+Request client to send a certificate. If you also want to require
+it, set @samp{auth-ssl-require-client-cert? #t} in auth section.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string ssl-cert-username-field
+Which field from certificate to use for username. commonName and
+x500UniqueIdentifier are the usual choices. You'll also need to set
+@samp{auth-ssl-username-from-cert? #t}.
+Defaults to @samp{"commonName"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} hours ssl-parameters-regenerate
+How often to regenerate the SSL parameters file. Generation is
+quite CPU intensive operation. The value is in hours, 0 disables
+regeneration entirely.
+Defaults to @samp{168}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string ssl-protocols
+SSL protocols to use.
+Defaults to @samp{"!SSLv2"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string ssl-cipher-list
+SSL ciphers to use.
+Defaults to @samp{"ALL:!LOW:!SSLv2:!EXP:!aNULL"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string ssl-crypto-device
+SSL crypto device to use, for valid values run "openssl engine".
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string postmaster-address
+Address to use when sending rejection mails.
+Default is postmaster@@<your domain>. %d expands to recipient domain.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string hostname
+Hostname to use in various parts of sent mails (e.g. in Message-Id)
+and in LMTP replies. Default is the system's real hostname@@domain.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean quota-full-tempfail?
+If user is over quota, return with temporary failure instead of
+bouncing the mail.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} file-name sendmail-path
+Binary to use for sending mails.
+Defaults to @samp{"/usr/sbin/sendmail"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string submission-host
+If non-empty, send mails via this SMTP host[:port] instead of
+sendmail.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string rejection-subject
+Subject: header to use for rejection mails. You can use the same
+variables as for @samp{rejection-reason} below.
+Defaults to @samp{"Rejected: %s"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string rejection-reason
+Human readable error message for rejection mails. You can use
+variables:
+
+@table @code
+@item %n
+CRLF
+@item %r
+reason
+@item %s
+original subject
+@item %t
+recipient
+@end table
+Defaults to @samp{"Your message to <%t> was automatically rejected:%n%r"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string recipient-delimiter
+Delimiter character between local-part and detail in email
+address.
+Defaults to @samp{"+"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string lda-original-recipient-header
+Header where the original recipient address (SMTP's RCPT TO:
+address) is taken from if not available elsewhere. With dovecot-lda -a
+parameter overrides this. A commonly used header for this is
+X-Original-To.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean lda-mailbox-autocreate?
+Should saving a mail to a nonexistent mailbox automatically create
+it?.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} boolean lda-mailbox-autosubscribe?
+Should automatically created mailboxes be also automatically
+subscribed?.
+Defaults to @samp{#f}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer imap-max-line-length
+Maximum IMAP command line length. Some clients generate very long
+command lines with huge mailboxes, so you may need to raise this if you
+get "Too long argument" or "IMAP command line too large" errors
+often.
+Defaults to @samp{64000}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string imap-logout-format
+IMAP logout format string:
+@table @code
+@item %i
+total number of bytes read from client
+@item %o
+total number of bytes sent to client.
+@end table
+Defaults to @samp{"in=%i out=%o"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string imap-capability
+Override the IMAP CAPABILITY response. If the value begins with '+',
+add the given capabilities on top of the defaults (e.g. +XFOO XBAR).
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string imap-idle-notify-interval
+How long to wait between "OK Still here" notifications when client
+is IDLEing.
+Defaults to @samp{"2 mins"}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string imap-id-send
+ID field names and values to send to clients. Using * as the value
+makes Dovecot use the default value. The following fields have default
+values currently: name, version, os, os-version, support-url,
+support-email.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string imap-id-log
+ID fields sent by client to log. * means everything.
+Defaults to @samp{""}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list imap-client-workarounds
+Workarounds for various client bugs:
+
+@table @code
+@item delay-newmail
+Send EXISTS/RECENT new mail notifications only when replying to NOOP and
+CHECK commands. Some clients ignore them otherwise, for example OSX
+Mail (<v2.1). Outlook Express breaks more badly though, without this it
+may show user "Message no longer in server" errors. Note that OE6
+still breaks even with this workaround if synchronization is set to
+"Headers Only".
+
+@item tb-extra-mailbox-sep
+Thunderbird gets somehow confused with LAYOUT=fs (mbox and dbox) and
+adds extra @samp{/} suffixes to mailbox names. This option causes Dovecot to
+ignore the extra @samp{/} instead of treating it as invalid mailbox name.
+
+@item tb-lsub-flags
+Show \Noselect flags for LSUB replies with LAYOUT=fs (e.g. mbox).
+This makes Thunderbird realize they aren't selectable and show them
+greyed out, instead of only later giving "not selectable" popup error.
+@end table
+Defaults to @samp{()}.
+@end deftypevr
+
+@deftypevr {@code{dovecot-configuration} parameter} string imap-urlauth-host
+Host allowed in URLAUTH URLs sent by client. "*" allows all.
+Defaults to @samp{""}.
+@end deftypevr
+
+
+Whew! Lots of configuration options. The nice thing about it though is
+that GuixSD has a complete interface to Dovecot's configuration
+language. This allows not only a nice way to declare configurations,
+but also offers reflective capabilities as well: users can write code to
+inspect and transform configurations from within Scheme.
+
+However, it could be that you just want to get a @code{dovecot.conf} up
+and running. In that case, you can pass an
+@code{opaque-dovecot-configuration} as the @code{#:config} paramter to
+@code{dovecot-service}. As its name indicates, an opaque configuration
+does not have easy reflective capabilities.
+
+Available @code{opaque-dovecot-configuration} fields are:
+
+@deftypevr {@code{opaque-dovecot-configuration} parameter} package dovecot
+The dovecot package.
+@end deftypevr
+
+@deftypevr {@code{opaque-dovecot-configuration} parameter} string string
+The contents of the @code{dovecot.conf}, as a string.
+@end deftypevr
+
+For example, if your @code{dovecot.conf} is just the empty string, you
+could instantiate a dovecot service like this:
+
+@example
+(dovecot-service #:config
+ (opaque-dovecot-configuration
+ (string "")))
+@end example
+
@node Web Services
@subsubsection Web Services
diff --git a/gnu-system.am b/gnu-system.am
index 09525da28f..3c8f402fa6 100644
--- a/gnu-system.am
+++ b/gnu-system.am
@@ -361,6 +361,7 @@ GNU_SYSTEM_MODULES = \
gnu/services/desktop.scm \
gnu/services/dmd.scm \
gnu/services/lirc.scm \
+ gnu/services/mail.scm \
gnu/services/networking.scm \
gnu/services/ssh.scm \
gnu/services/web.scm \
diff --git a/gnu/services/mail.scm b/gnu/services/mail.scm
new file mode 100644
index 0000000000..f49a4a4341
--- /dev/null
+++ b/gnu/services/mail.scm
@@ -0,0 +1,1692 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 Andy Wingo <wingo@igalia.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+;;;
+;;; Some of the help text was taken from the default dovecot.conf files.
+
+(define-module (gnu services mail)
+ #:use-module (gnu services)
+ #:use-module (gnu services base)
+ #:use-module (gnu services dmd)
+ #:use-module (gnu system pam)
+ #:use-module (gnu system shadow)
+ #:use-module (gnu packages mail)
+ #:use-module (gnu packages admin)
+ #:use-module (gnu packages tls)
+ #:use-module (guix records)
+ #:use-module (guix packages)
+ #:use-module (guix gexp)
+ #:use-module (srfi srfi-34)
+ #:use-module (srfi srfi-35)
+ #:use-module (ice-9 match)
+ #:export (&dovecot-configuation-error
+ dovecot-configuration-error?
+
+ dovecot-service
+ dovecot-configuration
+ opaque-dovecot-configuration
+
+ dict-configuration
+ passdb-configuration
+ userdb-configuration
+ unix-listener-configuration
+ fifo-listener-configuration
+ inet-listener-configuration
+ service-configuration
+ protocol-configuration
+ plugin-configuration
+ mailbox-configuration
+ namespace-configuration))
+
+;;; Commentary:
+;;;
+;;; This module provides service definitions for the Dovecot POP3 and IMAP
+;;; mail server.
+;;;
+;;; Code:
+
+(define-condition-type &dovecot-configuration-error &error
+ dovecot-configuration-error?)
+
+(define (dovecot-error message)
+ (raise (condition (&message (message message))
+ (&dovecot-configuration-error))))
+(define (dovecot-configuration-field-error field val)
+ (dovecot-error
+ (format #f "Invalid value for field ~a: ~s" field val)))
+(define (dovecot-configuration-missing-field kind field)
+ (dovecot-error
+ (format #f "~a configuration missing required field ~a" kind field)))
+
+(define-record-type* <configuration-field>
+ configuration-field make-configuration-field configuration-field?
+ (name configuration-field-name)
+ (type configuration-field-type)
+ (getter configuration-field-getter)
+ (predicate configuration-field-predicate)
+ (serializer configuration-field-serializer)
+ (default-value-thunk configuration-field-default-value-thunk)
+ (documentation configuration-field-documentation))
+
+(define-syntax define-configuration
+ (lambda (stx)
+ (define (id ctx part . parts)
+ (let ((part (syntax->datum part)))
+ (datum->syntax
+ ctx
+ (match parts
+ (() part)
+ (parts (symbol-append part
+ (syntax->datum (apply id ctx parts))))))))
+ (syntax-case stx ()
+ ((_ stem (field (field-type def) doc) ...)
+ (with-syntax (((field-getter ...)
+ (map (lambda (field)
+ (id #'stem #'stem #'- field))
+ #'(field ...)))
+ ((field-predicate ...)
+ (map (lambda (type)
+ (id #'stem type #'?))
+ #'(field-type ...)))
+ ((field-serializer ...)
+ (map (lambda (type)
+ (id #'stem #'serialize- type))
+ #'(field-type ...))))
+ #`(begin
+ (define-record-type* #,(id #'stem #'< #'stem #'>)
+ stem #,(id #'stem #'make- #'stem) #,(id #'stem #'stem #'?)
+ (field field-getter (default def))
+ ...)
+ (define #,(id #'stem #'stem #'-fields)
+ (list (configuration-field
+ (name 'field)
+ (type 'field-type)
+ (getter field-getter)
+ (predicate field-predicate)
+ (serializer field-serializer)
+ (default-value-thunk (lambda () def))
+ (documentation doc))
+ ...))))))))
+
+(define (serialize-configuration config fields)
+ (for-each (lambda (field)
+ ((configuration-field-serializer field)
+ (configuration-field-name field)
+ ((configuration-field-getter field) config)))
+ fields))
+
+(define (validate-configuration config fields)
+ (for-each (lambda (field)
+ (let ((val ((configuration-field-getter field) config)))
+ (unless ((configuration-field-predicate field) val)
+ (dovecot-configuration-field-error
+ (configuration-field-name field) val))))
+ fields))
+
+(define (validate-package field-name package)
+ (unless (package? package)
+ (dovecot-configuration-field-error field-name package)))
+
+(define (uglify-field-name field-name)
+ (let ((str (symbol->string field-name)))
+ (string-join (string-split (if (string-suffix? "?" str)
+ (substring str 0 (1- (string-length str)))
+ str)
+ #\-)
+ "_")))
+
+(define (serialize-package field-name val)
+ #f)
+
+(define (serialize-field field-name val)
+ (format #t "~a=~a\n" (uglify-field-name field-name) val))
+
+(define (serialize-string field-name val)
+ (serialize-field field-name val))
+
+(define (space-separated-string-list? val)
+ (and (list? val)
+ (and-map (lambda (x)
+ (and (string? x) (not (string-index x #\space))))
+ val)))
+(define (serialize-space-separated-string-list field-name val)
+ (serialize-field field-name (string-join val " ")))
+
+(define (comma-separated-string-list? val)
+ (and (list? val)
+ (and-map (lambda (x)
+ (and (string? x) (not (string-index x #\,))))
+ val)))
+(define (serialize-comma-separated-string-list field-name val)
+ (serialize-field field-name (string-join val ",")))
+
+(define (file-name? val)
+ (and (string? val)
+ (string-prefix? "/" val)))
+(define (serialize-file-name field-name val)
+ (serialize-string field-name val))
+
+(define (colon-separated-file-name-list? val)
+ (and (list? val)
+ ;; Trailing slashes not needed and not
+ (and-map file-name? val)))
+(define (serialize-colon-separated-file-name-list field-name val)
+ (serialize-field field-name (string-join val ":")))
+
+(define (serialize-boolean field-name val)
+ (serialize-string field-name (if val "yes" "no")))
+
+(define (non-negative-integer? val)
+ (and (exact-integer? val) (not (negative? val))))
+(define (serialize-non-negative-integer field-name val)
+ (serialize-field field-name val))
+
+(define (hours? val) (non-negative-integer? val))
+(define (serialize-hours field-name val)
+ (serialize-field field-name (format #f "~a hours" val)))
+
+(define (free-form-fields? val)
+ (match val
+ (() #t)
+ ((((? symbol?) . (? string)) . val) (free-form-fields? val))
+ (_ #f)))
+(define (serialize-free-form-fields field-name val)
+ (for-each (match-lambda ((k . v) (serialize-field k v))) val))
+
+(define (free-form-args? val)
+ (match val
+ (() #t)
+ ((((? symbol?) . (? string)) . val) (free-form-args? val))
+ (_ #f)))
+(define (serialize-free-form-args field-name val)
+ (serialize-field field-name
+ (string-join
+ (map (match-lambda ((k . v) (format #t "~a=~a" k v))) val)
+ " ")))
+
+(define-configuration dict-configuration
+ (entries
+ (free-form-fields '())
+ "A list of key-value pairs that this dict should hold."))
+
+(define (serialize-dict-configuration field-name val)
+ (format #t "dict {\n")
+ (serialize-configuration val dict-configuration-fields)
+ (format #t "}\n"))
+
+(define-configuration passdb-configuration
+ (driver
+ (string "pam")
+ "The driver that the passdb should use. Valid values include
+@samp{pam}, @samp{passwd}, @samp{shadow}, @samp{bsdauth}, and
+@samp{static}.")
+ (args
+ (free-form-args '())
+ "A list of key-value args to the passdb driver."))
+
+(define (serialize-passdb-configuration field-name val)
+ (format #t "passdb {\n")
+ (serialize-configuration val passdb-configuration-fields)
+ (format #t "}\n"))
+(define (passdb-configuration-list? val)
+ (and (list? val) (and-map passdb-configuration? val)))
+(define (serialize-passdb-configuration-list field-name val)
+ (for-each (lambda (val) (serialize-passdb-configuration field-name val)) val))
+
+(define-configuration userdb-configuration
+ (driver
+ (string "passwd")
+ "The driver that the userdb should use. Valid values include
+@samp{passwd} and @samp{static}.")
+ (args
+ (free-form-args '())
+ "A list of key-value args to the userdb driver.")
+ (override-fields
+ (free-form-args '())
+ "Override fields from passwd."))
+
+(define (serialize-userdb-configuration field-name val)
+ (format #t "userdb {\n")
+ (serialize-configuration val userdb-configuration-fields)
+ (format #t "}\n"))
+(define (userdb-configuration-list? val)
+ (and (list? val) (and-map userdb-configuration? val)))
+(define (serialize-userdb-configuration-list field-name val)
+ (for-each (lambda (val) (serialize-userdb-configuration field-name val)) val))
+
+(define-configuration unix-listener-configuration
+ (path
+ (file-name (dovecot-configuration-missing-field 'unix-listener 'path))
+ "The file name on which to listen.")
+ (mode
+ (string "0600")
+ "The access mode for the socket.")
+ (user
+ (string "")
+ "The user to own the the socket.")
+ (group
+ (string "")
+ "The group to own the socket."))
+
+(define (serialize-unix-listener-configuration field-name val)
+ (format #t "unix_listener ~a {\n" (unix-listener-configuration-path val))
+ (serialize-configuration val (cdr unix-listener-configuration-fields))
+ (format #t "}\n"))
+
+(define-configuration fifo-listener-configuration
+ (path
+ (file-name (dovecot-configuration-missing-field 'fifo-listener 'path))
+ "The file name on which to listen.")
+ (mode
+ (string "0600")
+ "The access mode for the socket.")
+ (user
+ (string "")
+ "The user to own the the socket.")
+ (group
+ (string "")
+ "The group to own the socket."))
+
+(define (serialize-fifo-listener-configuration field-name val)
+ (format #t "fifo_listener ~a {\n" (fifo-listener-configuration-path val))
+ (serialize-configuration val (cdr fifo-listener-configuration-fields))
+ (format #t "}\n"))
+
+(define-configuration inet-listener-configuration
+ (protocol
+ (string (dovecot-configuration-missing-field 'inet-listener 'protocol))
+ "The protocol to listen for.")
+ (address
+ (string "")
+ "The address on which to listen, or empty for all addresses.")
+ (port
+ (non-negative-integer
+ (dovecot-configuration-missing-field 'inet-listener 'port))
+ "The port on which to listen.")
+ (ssl?
+ (boolean #t)
+ "Whether to use SSL for this service; @samp{yes}, @samp{no}, or
+@samp{required}."))
+
+(define (serialize-inet-listener-configuration field-name val)
+ (format #t "inet_listener ~a {\n" (inet-listener-configuration-protocol val))
+ (serialize-configuration val (cdr inet-listener-configuration-fields))
+ (format #t "}\n"))
+
+(define (listener-configuration? val)
+ (or (unix-listener-configuration? val)
+ (fifo-listener-configuration? val)
+ (inet-listener-configuration? val)))
+(define (serialize-listener-configuration field-name val)
+ (cond
+ ((unix-listener-configuration? val)
+ (serialize-unix-listener-configuration field-name val))
+ ((fifo-listener-configuration? val)
+ (serialize-fifo-listener-configuration field-name val))
+ ((inet-listener-configuration? val)
+ (serialize-inet-listener-configuration field-name val))
+ (else (dovecot-configuration-field-error field-name val))))
+(define (listener-configuration-list? val)
+ (and (list? val) (and-map listener-configuration? val)))
+(define (serialize-listener-configuration-list field-name val)
+ (for-each (lambda (val)
+ (serialize-listener-configuration field-name val))
+ val))
+
+(define-configuration service-configuration
+ (kind
+ (string (dovecot-configuration-missing-field 'service 'kind))
+ "The service kind. Valid values include @code{director},
+@code{imap-login}, @code{pop3-login}, @code{lmtp}, @code{imap},
+@code{pop3}, @code{auth}, @code{auth-worker}, @code{dict},
+@code{tcpwrap}, @code{quota-warning}, or anything else.")
+ (listeners
+ (listener-configuration-list '())
+ "Listeners for the service. A listener is either an
+@code{unix-listener-configuration}, a @code{fifo-listener-configuration}, or
+an @code{inet-listener-configuration}.")
+ (service-count
+ (non-negative-integer 1)
+ "Number of connections to handle before starting a new process.
+Typically the only useful values are 0 (unlimited) or 1. 1 is more
+secure, but 0 is faster. <doc/wiki/LoginProcess.txt>.")
+ (process-min-avail
+ (non-negative-integer 0)
+ "Number of processes to always keep waiting for more connections.")
+ ;; FIXME: Need to be able to take the default for this value from other
+ ;; parts of the config.
+ (vsz-limit
+ (non-negative-integer #e256e6)
+ "If you set @samp{service-count 0}, you probably need to grow
+this."))
+
+(define (serialize-service-configuration field-name val)
+ (format #t "service ~a {\n" (service-configuration-kind val))
+ (serialize-configuration val (cdr service-configuration-fields))
+ (format #t "}\n"))
+(define (service-configuration-list? val)
+ (and (list? val) (and-map service-configuration? val)))
+(define (serialize-service-configuration-list field-name val)
+ (for-each (lambda (val)
+ (serialize-service-configuration field-name val))
+ val))
+
+(define-configuration protocol-configuration
+ (name
+ (string (dovecot-configuration-missing-field 'protocol 'name))
+ "The name of the protocol.")
+ (auth-socket-path
+ (string "/var/run/dovecot/auth-userdb")
+ "UNIX socket path to master authentication server to find users.
+This is used by imap (for shared users) and lda.")
+ (mail-plugins
+ (space-separated-string-list '("$mail_plugins"))
+ "Space separated list of plugins to load.")
+ (mail-max-userip-connections
+ (non-negative-integer 10)
+ "Maximum number of IMAP connections allowed for a user from each IP
+address. NOTE: The username is compared case-sensitively."))
+
+(define (serialize-protocol-configuration field-name val)
+ (format #t "protocol ~a {\n" (protocol-configuration-name val))
+ (serialize-configuration val (cdr protocol-configuration-fields))
+ (format #t "}\n"))
+(define (protocol-configuration-list? val)
+ (and (list? val) (and-map protocol-configuration? val)))
+(define (serialize-protocol-configuration-list field-name val)
+ (serialize-field 'protocols
+ (string-join (map protocol-configuration-name val) " "))
+ (for-each (lambda (val)
+ (serialize-protocol-configuration field-name val))
+ val))
+
+(define-configuration plugin-configuration
+ (entries
+ (free-form-fields '())
+ "A list of key-value pairs that this dict should hold."))
+
+(define (serialize-plugin-configuration field-name val)
+ (format #t "plugin {\n")
+ (serialize-configuration val plugin-configuration-fields)
+ (format #t "}\n"))
+
+(define-configuration mailbox-configuration
+ (name
+ (string (error "mailbox name is required"))
+ "Name for this mailbox.")
+
+ (auto
+ (string "no")
+ "@samp{create} will automatically create this mailbox.
+@samp{subscribe} will both create and subscribe to the mailbox.")
+
+ (special-use
+ (space-separated-string-list '())
+ "List of IMAP @code{SPECIAL-USE} attributes as specified by RFC 6154.
+Valid values are @code{\\All}, @code{\\Archive}, @code{\\Drafts},
+@code{\\Flagged}, @code{\\Junk}, @code{\\Sent}, and @code{\\Trash}."))
+
+(define (serialize-mailbox-configuration field-name val)
+ (format #t "mailbox \"~a\" {\n" (mailbox-configuration-name val))
+ (serialize-configuration val (cdr mailbox-configuration-fields))
+ (format #t "}\n"))
+(define (mailbox-configuration-list? val)
+ (and (list? val) (and-map mailbox-configuration? val)))
+(define (serialize-mailbox-configuration-list field-name val)
+ (for-each (lambda (val)
+ (serialize-mailbox-configuration field-name val))
+ val))
+
+(define-configuration namespace-configuration
+ (name
+ (string (error "namespace name is required"))
+ "Name for this namespace.")
+
+ (type
+ (string "private")
+ "Namespace type: @samp{private}, @samp{shared} or @samp{public}.")
+
+ (separator
+ (string "")
+ "Hierarchy separator to use. You should use the same separator for
+all namespaces or some clients get confused. @samp{/} is usually a good
+one. The default however depends on the underlying mail storage
+format.")
+
+ (prefix
+ (string "")
+ "Prefix required to access this namespace. This needs to be
+different for all namespaces. For example @samp{Public/}.")
+
+ (location
+ (string "")
+ "Physical location of the mailbox. This is in same format as
+mail_location, which is also the default for it.")
+
+ (inbox?
+ (boolean #f)
+ "There can be only one INBOX, and this setting defines which
+namespace has it.")
+
+ (hidden?
+ (boolean #f)
+ "If namespace is hidden, it's not advertised to clients via NAMESPACE
+extension. You'll most likely also want to set @samp{list? #f}. This is mostly
+useful when converting from another server with different namespaces
+which you want to deprecate but still keep working. For example you can
+create hidden namespaces with prefixes @samp{~/mail/}, @samp{~%u/mail/}
+and @samp{mail/}.")
+
+ (list?
+ (boolean #t)
+ "Show the mailboxes under this namespace with LIST command. This
+makes the namespace visible for clients that don't support NAMESPACE
+extension. The special @code{children} value lists child mailboxes, but
+hides the namespace prefix.")
+
+ (subscriptions?
+ (boolean #t)
+ "Namespace handles its own subscriptions. If set to @code{#f}, the
+parent namespace handles them. The empty prefix should always have this
+as @code{#t}.)")
+
+ (mailboxes
+ (mailbox-configuration-list '())
+ "List of predefined mailboxes in this namespace."))
+
+(define (serialize-namespace-configuration field-name val)
+ (format #t "namespace ~a {\n" (namespace-configuration-name val))
+ (serialize-configuration val (cdr namespace-configuration-fields))
+ (format #t "}\n"))
+(define (list-of-namespace-configuration? val)
+ (and (list? val) (and-map namespace-configuration? val)))
+(define (serialize-list-of-namespace-configuration field-name val)
+ (for-each (lambda (val)
+ (serialize-namespace-configuration field-name val))
+ val))
+
+(define-configuration dovecot-configuration
+ (dovecot
+ (package dovecot)
+ "The dovecot package.")
+
+ (listen
+ (comma-separated-string-list '("*" "::"))
+ "A list of IPs or hosts where to listen in for connections. @samp{*}
+listens in all IPv4 interfaces, @samp{::} listens in all IPv6
+interfaces. If you want to specify non-default ports or anything more
+complex, customize the address and port fields of the
+@samp{inet-listener} of the specific services you are interested in.")
+
+ (protocols
+ (protocol-configuration-list
+ (list (protocol-configuration
+ (name "imap"))))
+ "List of protocols we want to serve. Available protocols include
+@samp{imap}, @samp{pop3}, and @samp{lmtp}.")
+
+ (services
+ (service-configuration-list
+ (list
+ (service-configuration
+ (kind "imap-login")
+ (listeners
+ (list
+ (inet-listener-configuration (protocol "imap") (port 143) (ssl? #f))
+ (inet-listener-configuration (protocol "imaps") (port 993) (ssl? #t)))))
+ (service-configuration
+ (kind "pop3-login")
+ (listeners
+ (list
+ (inet-listener-configuration (protocol "pop3") (port 110) (ssl? #f))
+ (inet-listener-configuration (protocol "pop3s") (port 995) (ssl? #t)))))
+ (service-configuration
+ (kind "lmtp")
+ (listeners
+ (list (unix-listener-configuration (path "lmtp") (mode "0666")))))
+ (service-configuration (kind "imap"))
+ (service-configuration (kind "pop3"))
+ (service-configuration (kind "auth")
+ ;; In what could be taken to be a bug, the default value of 1 for
+ ;; service-count makes it so that a PAM auth worker can't fork off
+ ;; subprocesses for making blocking queries. The result is that nobody
+ ;; can log in -- very secure, but not very useful! If we simply omit
+ ;; the service-count, it will default to the value of
+ ;; auth-worker-max-count, which is 30, instead of defaulting to 1, which
+ ;; is the default for all other services. As a hack, bump this value to
+ ;; 30.
+ (service-count 30)
+ (listeners
+ (list (unix-listener-configuration (path "auth-userdb")))))
+ (service-configuration (kind "auth-worker"))
+ (service-configuration (kind "dict")
+ (listeners (list (unix-listener-configuration (path "dict")))))))
+ "List of services to enable. Available services include @samp{imap},
+@samp{imap-login}, @samp{pop3}, @samp{pop3-login}, @samp{auth}, and
+@samp{lmtp}.")
+
+ (dict
+ (dict-configuration (dict-configuration))
+ "Dict configuration, as created by the @code{dict-configuration}
+constructor.")
+
+ (passdbs
+ (passdb-configuration-list (list (passdb-configuration (driver "pam"))))
+ "List of passdb configurations, each one created by the
+@code{passdb-configuration} constructor.")
+
+ (userdbs
+ (userdb-configuration-list (list (userdb-configuration (driver "passwd"))))
+ "List of userdb configurations, each one created by the
+@code{userdb-configuration} constructor.")
+
+ (plugin-configuration
+ (plugin-configuration (plugin-configuration))
+ "Plug-in configuration, created by the @code{plugin-configuration}
+constructor.")
+
+ (namespaces
+ (list-of-namespace-configuration
+ (list
+ (namespace-configuration
+ (name "inbox")
+ (prefix "")
+ (inbox? #t)
+ (mailboxes
+ (list
+ (mailbox-configuration (name "Drafts") (special-use '("\\Drafts")))
+ (mailbox-configuration (name "Junk") (special-use '("\\Junk")))
+ (mailbox-configuration (name "Trash") (special-use '("\\Trash")))
+ (mailbox-configuration (name "Sent") (special-use '("\\Sent")))
+ (mailbox-configuration (name "Sent Messages") (special-use '("\\Sent")))
+ (mailbox-configuration (name "Drafts") (special-use '("\\Drafts"))))))))
+ "List of namespaces. Each item in the list is created by the
+@code{namespace-configuration} constructor.")
+
+ (base-dir
+ (file-name "/var/run/dovecot/")
+ "Base directory where to store runtime data.")
+
+ (login-greeting
+ (string "Dovecot ready.")
+ "Greeting message for clients.")
+
+ (login-trusted-networks
+ (space-separated-string-list '())
+ "List of trusted network ranges. Connections from these IPs are
+allowed to override their IP addresses and ports (for logging and for
+authentication checks). @samp{disable-plaintext-auth} is also ignored
+for these networks. Typically you'd specify your IMAP proxy servers
+here.")
+
+ (login-access-sockets
+ (space-separated-string-list '())
+ "List of login access check sockets (e.g. tcpwrap).")
+
+ (verbose-proctitle?
+ (boolean #f)
+ "Show more verbose process titles (in ps). Currently shows user name
+and IP address. Useful for seeing who are actually using the IMAP
+processes (e.g. shared mailboxes or if same uid is used for multiple
+accounts).")
+
+ (shutdown-clients?
+ (boolean #t)
+ "Should all processes be killed when Dovecot master process shuts down.
+Setting this to @code{#f} means that Dovecot can be upgraded without
+forcing existing client connections to close (although that could also
+be a problem if the upgrade is e.g. because of a security fix).")
+
+ (doveadm-worker-count
+ (non-negative-integer 0)
+ "If non-zero, run mail commands via this many connections to doveadm
+server, instead of running them directly in the same process.")
+
+ (doveadm-socket-path
+ (string "doveadm-server")
+ "UNIX socket or host:port used for connecting to doveadm server.")
+
+ (import-environment
+ (space-separated-string-list '("TZ"))
+ "List of environment variables that are preserved on Dovecot startup
+and passed down to all of its child processes. You can also give
+key=value pairs to always set specific settings.")
+
+;;; Authentication processes
+
+ (disable-plaintext-auth?
+ (boolean #t)
+ "Disable LOGIN command and all other plaintext authentications unless
+SSL/TLS is used (LOGINDISABLED capability). Note that if the remote IP
+matches the local IP (i.e. you're connecting from the same computer),
+the connection is considered secure and plaintext authentication is
+allowed. See also ssl=required setting.")
+
+ (auth-cache-size
+ (non-negative-integer 0)
+ "Authentication cache size (e.g. @samp{#e10e6}). 0 means it's disabled.
+Note that bsdauth, PAM and vpopmail require @samp{cache-key} to be set
+for caching to be used.")
+
+ (auth-cache-ttl
+ (string "1 hour")
+ "Time to live for cached data. After TTL expires the cached record
+is no longer used, *except* if the main database lookup returns internal
+failure. We also try to handle password changes automatically: If
+user's previous authentication was successful, but this one wasn't, the
+cache isn't used. For now this works only with plaintext
+authentication.")
+
+ (auth-cache-negative-ttl
+ (string "1 hour")
+ "TTL for negative hits (user not found, password mismatch).
+0 disables caching them completely.")
+
+ (auth-realms
+ (space-separated-string-list '())
+ "List of realms for SASL authentication mechanisms that need them.
+You can leave it empty if you don't want to support multiple realms.
+Many clients simply use the first one listed here, so keep the default
+realm first.")
+
+ (auth-default-realm
+ (string "")
+ "Default realm/domain to use if none was specified. This is used for
+both SASL realms and appending @@domain to username in plaintext
+logins.")
+
+ (auth-username-chars
+ (string
+ "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@")
+ "List of allowed characters in username. If the user-given username
+contains a character not listed in here, the login automatically fails.
+This is just an extra check to make sure user can't exploit any
+potential quote escaping vulnerabilities with SQL/LDAP databases. If
+you want to allow all characters, set this value to empty.")
+
+ (auth-username-translation
+ (string "")
+ "Username character translations before it's looked up from
+databases. The value contains series of from -> to characters. For
+example @samp{#@@/@@} means that @samp{#} and @samp{/} characters are
+translated to @samp{@@}.")
+
+ (auth-username-format
+ (string "%Lu")
+ "Username formatting before it's looked up from databases. You can
+use the standard variables here, e.g. %Lu would lowercase the username,
+%n would drop away the domain if it was given, or @samp{%n-AT-%d} would
+change the @samp{@@} into @samp{-AT-}. This translation is done after
+@samp{auth-username-translation} changes.")
+
+ (auth-master-user-separator
+ (string "")
+ "If you want to allow master users to log in by specifying the master
+username within the normal username string (i.e. not using SASL
+mechanism's support for it), you can specify the separator character
+here. The format is then <username><separator><master username>.
+UW-IMAP uses @samp{*} as the separator, so that could be a good
+choice.")
+
+ (auth-anonymous-username
+ (string "anonymous")
+ "Username to use for users logging in with ANONYMOUS SASL
+mechanism.")
+
+ (auth-worker-max-count
+ (non-negative-integer 30)
+ "Maximum number of dovecot-auth worker processes. They're used to
+execute blocking passdb and userdb queries (e.g. MySQL and PAM).
+They're automatically created and destroyed as needed.")
+
+ (auth-gssapi-hostname
+ (string "")
+ "Host name to use in GSSAPI principal names. The default is to use
+the name returned by gethostname(). Use @samp{$ALL} (with quotes) to
+allow all keytab entries.")
+
+ (auth-krb5-keytab
+ (string "")
+ "Kerberos keytab to use for the GSSAPI mechanism. Will use the
+system default (usually /etc/krb5.keytab) if not specified. You may
+need to change the auth service to run as root to be able to read this
+file.")
+
+ (auth-use-winbind?
+ (boolean #f)
+ "Do NTLM and GSS-SPNEGO authentication using Samba's winbind daemon
+and @samp{ntlm-auth} helper.
+<doc/wiki/Authentication/Mechanisms/Winbind.txt>.")
+
+ (auth-winbind-helper-path
+ (file-name "/usr/bin/ntlm_auth")
+ "Path for Samba's @samp{ntlm-auth} helper binary.")
+
+ (auth-failure-delay
+ (string "2 secs")
+ "Time to delay before replying to failed authentications.")
+
+ (auth-ssl-require-client-cert?
+ (boolean #f)
+ "Require a valid SSL client certificate or the authentication
+fails.")
+
+ (auth-ssl-username-from-cert?
+ (boolean #f)
+ "Take the username from client's SSL certificate, using
+@code{X509_NAME_get_text_by_NID()} which returns the subject's DN's
+CommonName.")
+
+ (auth-mechanisms
+ (space-separated-string-list '("plain"))
+ "List of wanted authentication mechanisms. Supported mechanisms are:
+@samp{plain}, @samp{login}, @samp{digest-md5}, @samp{cram-md5},
+@samp{ntlm}, @samp{rpa}, @samp{apop}, @samp{anonymous}, @samp{gssapi},
+@samp{otp}, @samp{skey}, and @samp{gss-spnego}. NOTE: See also
+@samp{disable-plaintext-auth} setting.")
+
+ (director-servers
+ (space-separated-string-list '())
+ "List of IPs or hostnames to all director servers, including ourself.
+Ports can be specified as ip:port. The default port is the same as what
+director service's @samp{inet-listener} is using.")
+
+ (director-mail-servers
+ (space-separated-string-list '())
+ "List of IPs or hostnames to all backend mail servers. Ranges are
+allowed too, like 10.0.0.10-10.0.0.30.")
+
+ (director-user-expire
+ (string "15 min")
+ "How long to redirect users to a specific server after it no longer
+has any connections.")
+
+ (director-doveadm-port
+ (non-negative-integer 0)
+ "TCP/IP port that accepts doveadm connections (instead of director
+connections) If you enable this, you'll also need to add
+@samp{inet-listener} for the port.")
+
+ (director-username-hash
+ (string "%Lu")
+ "How the username is translated before being hashed. Useful values
+include %Ln if user can log in with or without @@domain, %Ld if mailboxes
+are shared within domain.")
+
+;;; Log destination.
+
+ (log-path
+ (string "syslog")
+ "Log file to use for error messages. @samp{syslog} logs to syslog,
+@samp{/dev/stderr} logs to stderr.")
+
+ (info-log-path
+ (string "")
+ "Log file to use for informational messages. Defaults to
+@samp{log-path}.")
+
+ (debug-log-path
+ (string "")
+ "Log file to use for debug messages. Defaults to
+@samp{info-log-path}.")
+
+ (syslog-facility
+ (string "mail")
+ "Syslog facility to use if you're logging to syslog. Usually if you
+don't want to use @samp{mail}, you'll use local0..local7. Also other
+standard facilities are supported.")
+
+ (auth-verbose?
+ (boolean #f)
+ "Log unsuccessful authentication attempts and the reasons why they
+failed.")
+
+ (auth-verbose-passwords?
+ (boolean #f)
+ "In case of password mismatches, log the attempted password. Valid
+values are no, plain and sha1. sha1 can be useful for detecting brute
+force password attempts vs. user simply trying the same password over
+and over again. You can also truncate the value to n chars by appending
+\":n\" (e.g. sha1:6).")
+
+ (auth-debug?
+ (boolean #f)
+ "Even more verbose logging for debugging purposes. Shows for example
+SQL queries.")
+
+ (auth-debug-passwords?
+ (boolean #f)
+ "In case of password mismatches, log the passwords and used scheme so
+the problem can be debugged. Enabling this also enables
+@samp{auth-debug}.")
+
+ (mail-debug?
+ (boolean #f)
+ "Enable mail process debugging. This can help you figure out why
+Dovecot isn't finding your mails.")
+
+ (verbose-ssl?
+ (boolean #f)
+ "Show protocol level SSL errors.")
+
+ (log-timestamp
+ (string "\"%b %d %H:%M:%S \"")
+ "Prefix for each line written to log file. % codes are in
+strftime(3) format.")
+
+ (login-log-format-elements
+ (space-separated-string-list
+ '("user=<%u>" "method=%m" "rip=%r" "lip=%l" "mpid=%e" "%c"))
+ "List of elements we want to log. The elements which have a
+non-empty variable value are joined together to form a comma-separated
+string.")
+
+ (login-log-format
+ (string "%$: %s")
+ "Login log format. %s contains @samp{login-log-format-elements}
+string, %$ contains the data we want to log.")
+
+ (mail-log-prefix
+ (string "\"%s(%u): \"")
+ "Log prefix for mail processes. See doc/wiki/Variables.txt for list
+of possible variables you can use.")
+
+ (deliver-log-format
+ (string "msgid=%m: %$")
+ "Format to use for logging mail deliveries. You can use variables:
+@table @code
+@item %$
+Delivery status message (e.g. @samp{saved to INBOX})
+@item %m
+Message-ID
+@item %s
+Subject
+@item %f
+From address
+@item %p
+Physical size
+@item %w
+Virtual size.
+@end table")
+
+;;; Mailbox locations and namespaces
+
+ (mail-location
+ (string "")
+ "Location for users' mailboxes. The default is empty, which means
+that Dovecot tries to find the mailboxes automatically. This won't work
+if the user doesn't yet have any mail, so you should explicitly tell
+Dovecot the full location.
+
+If you're using mbox, giving a path to the INBOX
+file (e.g. /var/mail/%u) isn't enough. You'll also need to tell Dovecot
+where the other mailboxes are kept. This is called the \"root mail
+directory\", and it must be the first path given in the
+@samp{mail-location} setting.
+
+There are a few special variables you can use, eg.:
+
+@table @samp
+@item %u
+username
+@item %n
+user part in user@@domain, same as %u if there's no domain
+@item %d
+domain part in user@@domain, empty if there's no domain
+@item %h
+home director
+@end table
+
+See doc/wiki/Variables.txt for full list. Some examples:
+@table @samp
+@item maildir:~/Maildir
+@item mbox:~/mail:INBOX=/var/mail/%u
+@item mbox:/var/mail/%d/%1n/%n:INDEX=/var/indexes/%d/%1n/%
+@end table")
+
+ (mail-uid
+ (string "")
+ "System user and group used to access mails. If you use multiple,
+userdb can override these by returning uid or gid fields. You can use
+either numbers or names. <doc/wiki/UserIds.txt>.")
+
+ (mail-gid
+ (string "")
+ "")
+
+ (mail-privileged-group
+ (string "")
+ "Group to enable temporarily for privileged operations. Currently
+this is used only with INBOX when either its initial creation or
+dotlocking fails. Typically this is set to \"mail\" to give access to
+/var/mail.")
+
+ (mail-access-groups
+ (string "")
+ "Grant access to these supplementary groups for mail processes.
+Typically these are used to set up access to shared mailboxes. Note
+that it may be dangerous to set these if users can create
+symlinks (e.g. if \"mail\" group is set here, ln -s /var/mail ~/mail/var
+could allow a user to delete others' mailboxes, or ln -s
+/secret/shared/box ~/mail/mybox would allow reading it).")
+
+ (mail-full-filesystem-access?
+ (boolean #f)
+ "Allow full filesystem access to clients. There's no access checks
+other than what the operating system does for the active UID/GID. It
+works with both maildir and mboxes, allowing you to prefix mailboxes
+names with e.g. /path/ or ~user/.")
+
+;;; Mail processes
+
+ (mmap-disable?
+ (boolean #f)
+ "Don't use mmap() at all. This is required if you store indexes to
+shared filesystems (NFS or clustered filesystem).")
+
+ (dotlock-use-excl?
+ (boolean #t)
+ "Rely on @samp{O_EXCL} to work when creating dotlock files. NFS
+supports @samp{O_EXCL} since version 3, so this should be safe to use
+nowadays by default.")
+
+ (mail-fsync
+ (string "optimized")
+ "When to use fsync() or fdatasync() calls:
+@table @code
+@item optimized
+Whenever necessary to avoid losing important data
+@item always
+Useful with e.g. NFS when write()s are delayed
+@item never
+Never use it (best performance, but crashes can lose data).
+@end table")
+
+ (mail-nfs-storage?
+ (boolean #f)
+ "Mail storage exists in NFS. Set this to yes to make Dovecot flush
+NFS caches whenever needed. If you're using only a single mail server
+this isn't needed.")
+
+ (mail-nfs-index?
+ (boolean #f)
+ "Mail index files also exist in NFS. Setting this to yes requires
+@samp{mmap-disable? #t} and @samp{fsync-disable? #f}.")
+
+ (lock-method
+ (string "fcntl")
+ "Locking method for index files. Alternatives are fcntl, flock and
+dotlock. Dotlocking uses some tricks which may create more disk I/O
+than other locking methods. NFS users: flock doesn't work, remember to
+change @samp{mmap-disable}.")
+
+ (mail-temp-dir
+ (file-name "/tmp")
+ "Directory in which LDA/LMTP temporarily stores incoming mails >128
+kB.")
+
+ (first-valid-uid
+ (non-negative-integer 500)
+ "Valid UID range for users. This is mostly to make sure that users can't
+log in as daemons or other system users. Note that denying root logins is
+hardcoded to dovecot binary and can't be done even if @samp{first-valid-uid}
+is set to 0.")
+
+ (last-valid-uid
+ (non-negative-integer 0)
+ "")
+
+ (first-valid-gid
+ (non-negative-integer 1)
+ "Valid GID range for users. Users having non-valid GID as primary group ID
+aren't allowed to log in. If user belongs to supplementary groups with
+non-valid GIDs, those groups are not set.")
+
+ (last-valid-gid
+ (non-negative-integer 0)
+ "")
+
+ (mail-max-keyword-length
+ (non-negative-integer 50)
+ "Maximum allowed length for mail keyword name. It's only forced when
+trying to create new keywords.")
+
+ (valid-chroot-dirs
+ (colon-separated-file-name-list '())
+ "List of directories under which chrooting is allowed for mail
+processes (i.e. /var/mail will allow chrooting to /var/mail/foo/bar
+too). This setting doesn't affect @samp{login-chroot}
+@samp{mail-chroot} or auth chroot settings. If this setting is empty,
+\"/./\" in home dirs are ignored. WARNING: Never add directories here
+which local users can modify, that may lead to root exploit. Usually
+this should be done only if you don't allow shell access for users.
+<doc/wiki/Chrooting.txt>.")
+
+ (mail-chroot
+ (string "")
+ "Default chroot directory for mail processes. This can be overridden
+for specific users in user database by giving /./ in user's home
+directory (e.g. /home/./user chroots into /home). Note that usually
+there is no real need to do chrooting, Dovecot doesn't allow users to
+access files outside their mail directory anyway. If your home
+directories are prefixed with the chroot directory, append \"/.\" to
+@samp{mail-chroot}. <doc/wiki/Chrooting.txt>.")
+
+ (auth-socket-path
+ (file-name "/var/run/dovecot/auth-userdb")
+ "UNIX socket path to master authentication server to find users.
+This is used by imap (for shared users) and lda.")
+
+ (mail-plugin-dir
+ (file-name "/usr/lib/dovecot")
+ "Directory where to look up mail plugins.")
+
+ (mail-plugins
+ (space-separated-string-list '())
+ "List of plugins to load for all services. Plugins specific to IMAP,
+LDA, etc. are added to this list in their own .conf files.")
+
+
+ (mail-cache-min-mail-count
+ (non-negative-integer 0)
+ "The minimum number of mails in a mailbox before updates are done to
+cache file. This allows optimizing Dovecot's behavior to do less disk
+writes at the cost of more disk reads.")
+
+ (mailbox-idle-check-interval
+ (string "30 secs")
+ "When IDLE command is running, mailbox is checked once in a while to
+see if there are any new mails or other changes. This setting defines
+the minimum time to wait between those checks. Dovecot can also use
+dnotify, inotify and kqueue to find out immediately when changes
+occur.")
+
+ (mail-save-crlf?
+ (boolean #f)
+ "Save mails with CR+LF instead of plain LF. This makes sending those
+mails take less CPU, especially with sendfile() syscall with Linux and
+FreeBSD. But it also creates a bit more disk I/O which may just make it
+slower. Also note that if other software reads the mboxes/maildirs,
+they may handle the extra CRs wrong and cause problems.")
+
+ (maildir-stat-dirs?
+ (boolean #f)
+ "By default LIST command returns all entries in maildir beginning
+with a dot. Enabling this option makes Dovecot return only entries
+which are directories. This is done by stat()ing each entry, so it
+causes more disk I/O.
+ (For systems setting struct @samp{dirent->d_type} this check is free
+and it's done always regardless of this setting).")
+
+ (maildir-copy-with-hardlinks?
+ (boolean #t)
+ "When copying a message, do it with hard links whenever possible.
+This makes the performance much better, and it's unlikely to have any
+side effects.")
+
+ (maildir-very-dirty-syncs?
+ (boolean #f)
+ "Assume Dovecot is the only MUA accessing Maildir: Scan cur/
+directory only when its mtime changes unexpectedly or when we can't find
+the mail otherwise.")
+
+ (mbox-read-locks
+ (space-separated-string-list '("fcntl"))
+ "Which locking methods to use for locking mbox. There are four
+available:
+
+@table @code
+@item dotlock
+Create <mailbox>.lock file. This is the oldest and most NFS-safe
+solution. If you want to use /var/mail/ like directory, the users will
+need write access to that directory.
+@item dotlock-try
+Same as dotlock, but if it fails because of permissions or because there
+isn't enough disk space, just skip it.
+@item fcntl
+Use this if possible. Works with NFS too if lockd is used.
+@item flock
+May not exist in all systems. Doesn't work with NFS.
+@item lockf
+May not exist in all systems. Doesn't work with NFS.
+@end table
+
+You can use multiple locking methods; if you do the order they're declared
+in is important to avoid deadlocks if other MTAs/MUAs are using multiple
+locking methods as well. Some operating systems don't allow using some of
+them simultaneously.")
+
+ (mbox-write-locks
+ (space-separated-string-list '("dotlock" "fcntl"))
+ "")
+
+ (mbox-lock-timeout
+ (string "5 mins")
+ "Maximum time to wait for lock (all of them) before aborting.")
+
+ (mbox-dotlock-change-timeout
+ (string "2 mins")
+ "If dotlock exists but the mailbox isn't modified in any way,
+override the lock file after this much time.")
+
+ (mbox-dirty-syncs?
+ (boolean #t)
+ "When mbox changes unexpectedly we have to fully read it to find out
+what changed. If the mbox is large this can take a long time. Since
+the change is usually just a newly appended mail, it'd be faster to
+simply read the new mails. If this setting is enabled, Dovecot does
+this but still safely fallbacks to re-reading the whole mbox file
+whenever something in mbox isn't how it's expected to be. The only real
+downside to this setting is that if some other MUA changes message
+flags, Dovecot doesn't notice it immediately. Note that a full sync is
+done with SELECT, EXAMINE, EXPUNGE and CHECK commands.")
+
+ (mbox-very-dirty-syncs?
+ (boolean #f)
+ "Like @samp{mbox-dirty-syncs}, but don't do full syncs even with SELECT,
+EXAMINE, EXPUNGE or CHECK commands. If this is set,
+@samp{mbox-dirty-syncs} is ignored.")
+
+ (mbox-lazy-writes?
+ (boolean #t)
+ "Delay writing mbox headers until doing a full write sync (EXPUNGE
+and CHECK commands and when closing the mailbox). This is especially
+useful for POP3 where clients often delete all mails. The downside is
+that our changes aren't immediately visible to other MUAs.")
+
+ (mbox-min-index-size
+ (non-negative-integer 0)
+ "If mbox size is smaller than this (e.g. 100k), don't write index
+files. If an index file already exists it's still read, just not
+updated.")
+
+ (mdbox-rotate-size
+ (non-negative-integer #e2e6)
+ "Maximum dbox file size until it's rotated.")
+
+ (mdbox-rotate-interval
+ (string "1d")
+ "Maximum dbox file age until it's rotated. Typically in days. Day
+begins from midnight, so 1d = today, 2d = yesterday, etc. 0 = check
+disabled.")
+
+ (mdbox-preallocate-space?
+ (boolean #f)
+ "When creating new mdbox files, immediately preallocate their size to
+@samp{mdbox-rotate-size}. This setting currently works only in Linux
+with some filesystems (ext4, xfs).")
+
+ (mail-attachment-dir
+ (string "")
+ "sdbox and mdbox support saving mail attachments to external files,
+which also allows single instance storage for them. Other backends
+don't support this for now.
+
+WARNING: This feature hasn't been tested much yet. Use at your own risk.
+
+Directory root where to store mail attachments. Disabled, if empty.")
+
+ (mail-attachment-min-size
+ (non-negative-integer #e128e3)
+ "Attachments smaller than this aren't saved externally. It's also
+possible to write a plugin to disable saving specific attachments
+externally.")
+
+ (mail-attachment-fs
+ (string "sis posix")
+ "Filesystem backend to use for saving attachments:
+@table @code
+@item posix
+No SiS done by Dovecot (but this might help FS's own deduplication)
+@item sis posix
+SiS with immediate byte-by-byte comparison during saving
+@item sis-queue posix
+SiS with delayed comparison and deduplication.
+@end table")
+
+ (mail-attachment-hash
+ (string "%{sha1}")
+ "Hash format to use in attachment filenames. You can add any text and
+variables: @code{%@{md4@}}, @code{%@{md5@}}, @code{%@{sha1@}},
+@code{%@{sha256@}}, @code{%@{sha512@}}, @code{%@{size@}}. Variables can be
+truncated, e.g. @code{%@{sha256:80@}} returns only first 80 bits.")
+
+ (default-process-limit
+ (non-negative-integer 100)
+ "")
+
+ (default-client-limit
+ (non-negative-integer 1000)
+ "")
+
+ (default-vsz-limit
+ (non-negative-integer #e256e6)
+ "Default VSZ (virtual memory size) limit for service processes.
+This is mainly intended to catch and kill processes that leak memory
+before they eat up everything.")
+
+ (default-login-user
+ (string "dovenull")
+ "Login user is internally used by login processes. This is the most
+untrusted user in Dovecot system. It shouldn't have access to anything
+at all.")
+
+ (default-internal-user
+ (string "dovecot")
+ "Internal user is used by unprivileged processes. It should be
+separate from login user, so that login processes can't disturb other
+processes.")
+
+ (ssl?
+ (string "required")
+ "SSL/TLS support: yes, no, required. <doc/wiki/SSL.txt>.")
+
+ (ssl-cert
+ (string "</etc/dovecot/default.pem")
+ "PEM encoded X.509 SSL/TLS certificate (public key).")
+
+ (ssl-key
+ (string "</etc/dovecot/private/default.pem")
+ "PEM encoded SSL/TLS private key. The key is opened before
+dropping root privileges, so keep the key file unreadable by anyone but
+root.")
+
+ (ssl-key-password
+ (string "")
+ "If key file is password protected, give the password here.
+Alternatively give it when starting dovecot with -p parameter. Since
+this file is often world-readable, you may want to place this setting
+instead to a different.")
+
+ (ssl-ca
+ (string "")
+ "PEM encoded trusted certificate authority. Set this only if you
+intend to use @samp{ssl-verify-client-cert? #t}. The file should
+contain the CA certificate(s) followed by the matching
+CRL(s). (e.g. @samp{ssl-ca </etc/ssl/certs/ca.pem}).")
+ (ssl-require-crl?
+ (boolean #t)
+ "Require that CRL check succeeds for client certificates.")
+ (ssl-verify-client-cert?
+ (boolean #f)
+ "Request client to send a certificate. If you also want to require
+it, set @samp{auth-ssl-require-client-cert? #t} in auth section.")
+
+ (ssl-cert-username-field
+ (string "commonName")
+ "Which field from certificate to use for username. commonName and
+x500UniqueIdentifier are the usual choices. You'll also need to set
+@samp{auth-ssl-username-from-cert? #t}.")
+
+ (ssl-parameters-regenerate
+ (hours 168)
+ "How often to regenerate the SSL parameters file. Generation is
+quite CPU intensive operation. The value is in hours, 0 disables
+regeneration entirely.")
+
+ (ssl-protocols
+ (string "!SSLv2")
+ "SSL protocols to use.")
+
+ (ssl-cipher-list
+ (string "ALL:!LOW:!SSLv2:!EXP:!aNULL")
+ "SSL ciphers to use.")
+
+ (ssl-crypto-device
+ (string "")
+ "SSL crypto device to use, for valid values run \"openssl engine\".")
+
+ (postmaster-address
+ (string "")
+ "Address to use when sending rejection mails.
+Default is postmaster@@<your domain>. %d expands to recipient domain.")
+
+ (hostname
+ (string "")
+ "Hostname to use in various parts of sent mails (e.g. in Message-Id)
+and in LMTP replies. Default is the system's real hostname@@domain.")
+
+ (quota-full-tempfail?
+ (boolean #f)
+ "If user is over quota, return with temporary failure instead of
+bouncing the mail.")
+
+ (sendmail-path
+ (file-name "/usr/sbin/sendmail")
+ "Binary to use for sending mails.")
+
+ (submission-host
+ (string "")
+ "If non-empty, send mails via this SMTP host[:port] instead of
+sendmail.")
+
+ (rejection-subject
+ (string "Rejected: %s")
+ "Subject: header to use for rejection mails. You can use the same
+variables as for @samp{rejection-reason} below.")
+
+ (rejection-reason
+ (string "Your message to <%t> was automatically rejected:%n%r")
+ "Human readable error message for rejection mails. You can use
+variables:
+
+@table @code
+@item %n
+CRLF
+@item %r
+reason
+@item %s
+original subject
+@item %t
+recipient
+@end table")
+
+ (recipient-delimiter
+ (string "+")
+ "Delimiter character between local-part and detail in email
+address.")
+
+ (lda-original-recipient-header
+ (string "")
+ "Header where the original recipient address (SMTP's RCPT TO:
+address) is taken from if not available elsewhere. With dovecot-lda -a
+parameter overrides this. A commonly used header for this is
+X-Original-To.")
+
+ (lda-mailbox-autocreate?
+ (boolean #f)
+ "Should saving a mail to a nonexistent mailbox automatically create
+it?.")
+
+ (lda-mailbox-autosubscribe?
+ (boolean #f)
+ "Should automatically created mailboxes be also automatically
+subscribed?.")
+
+
+ (imap-max-line-length
+ (non-negative-integer #e64e3)
+ "Maximum IMAP command line length. Some clients generate very long
+command lines with huge mailboxes, so you may need to raise this if you
+get \"Too long argument\" or \"IMAP command line too large\" errors
+often.")
+
+ (imap-logout-format
+ (string "in=%i out=%o")
+ "IMAP logout format string:
+@table @code
+@item %i
+total number of bytes read from client
+@item %o
+total number of bytes sent to client.
+@end table")
+
+ (imap-capability
+ (string "")
+ "Override the IMAP CAPABILITY response. If the value begins with '+',
+add the given capabilities on top of the defaults (e.g. +XFOO XBAR).")
+
+ (imap-idle-notify-interval
+ (string "2 mins")
+ "How long to wait between \"OK Still here\" notifications when client
+is IDLEing.")
+
+ (imap-id-send
+ (string "")
+ "ID field names and values to send to clients. Using * as the value
+makes Dovecot use the default value. The following fields have default
+values currently: name, version, os, os-version, support-url,
+support-email.")
+
+ (imap-id-log
+ (string "")
+ "ID fields sent by client to log. * means everything.")
+
+ (imap-client-workarounds
+ (space-separated-string-list '())
+ "Workarounds for various client bugs:
+
+@table @code
+@item delay-newmail
+Send EXISTS/RECENT new mail notifications only when replying to NOOP and
+CHECK commands. Some clients ignore them otherwise, for example OSX
+Mail (<v2.1). Outlook Express breaks more badly though, without this it
+may show user \"Message no longer in server\" errors. Note that OE6
+still breaks even with this workaround if synchronization is set to
+\"Headers Only\".
+
+@item tb-extra-mailbox-sep
+Thunderbird gets somehow confused with LAYOUT=fs (mbox and dbox) and
+adds extra @samp{/} suffixes to mailbox names. This option causes Dovecot to
+ignore the extra @samp{/} instead of treating it as invalid mailbox name.
+
+@item tb-lsub-flags
+Show \\Noselect flags for LSUB replies with LAYOUT=fs (e.g. mbox).
+This makes Thunderbird realize they aren't selectable and show them
+greyed out, instead of only later giving \"not selectable\" popup error.
+@end table
+")
+
+ (imap-urlauth-host
+ (string "")
+ "Host allowed in URLAUTH URLs sent by client. \"*\" allows all.") )
+
+(define-configuration opaque-dovecot-configuration
+ (dovecot
+ (package dovecot)
+ "The dovecot package.")
+
+ (string
+ (string (dovecot-configuration-missing-field 'opaque-dovecot-configuration
+ 'string))
+ "The contents of the @code{dovecot.conf} to use."))
+
+(define %dovecot-accounts
+ ;; Account and group for the Dovecot daemon.
+ (list (user-group (name "dovecot") (system? #t))
+ (user-account
+ (name "dovecot")
+ (group "dovecot")
+ (system? #t)
+ (comment "Dovecot daemon user")
+ (home-directory "/var/empty")
+ (shell #~(string-append #$shadow "/sbin/nologin")))
+
+ (user-group (name "dovenull") (system? #t))
+ (user-account
+ (name "dovenull")
+ (group "dovenull")
+ (system? #t)
+ (comment "Dovecot daemon login user")
+ (home-directory "/var/empty")
+ (shell #~(string-append #$shadow "/sbin/nologin")))))
+
+(define %dovecot-activation
+ ;; Activation gexp.
+ #~(begin
+ (use-modules (guix build utils))
+ (define (mkdir-p/perms directory owner perms)
+ (mkdir-p directory)
+ (chown "/var/run/dovecot" (passwd:uid owner) (passwd:gid owner))
+ (chmod directory perms))
+ (define (build-subject parameters)
+ (string-concatenate
+ (map (lambda (pair)
+ (let ((k (car pair)) (v (cdr pair)))
+ (define (escape-char str chr)
+ (string-join (string-split str chr) (string #\\ chr)))
+ (string-append "/" k "="
+ (escape-char (escape-char v #\=) #\/))))
+ (filter (lambda (pair) (cdr pair)) parameters))))
+ (define* (create-self-signed-certificate-if-absent
+ #:key private-key public-key (owner (getpwnam "root"))
+ (common-name (gethostname))
+ (organization-name "GuixSD")
+ (organization-unit-name "Default Self-Signed Certificate")
+ (subject-parameters `(("CN" . ,common-name)
+ ("O" . ,organization-name)
+ ("OU" . ,organization-unit-name)))
+ (subject (build-subject subject-parameters)))
+ ;; Note that by default, OpenSSL outputs keys in PEM format. This
+ ;; is what we want.
+ (unless (file-exists? private-key)
+ (cond
+ ((zero? (system* (string-append #$openssl "/bin/openssl")
+ "genrsa" "-out" private-key "2048"))
+ (chown private-key (passwd:uid owner) (passwd:gid owner))
+ (chmod private-key #o400))
+ (else
+ (format (current-error-port)
+ "Failed to create private key at ~a.\n" private-key))))
+ (unless (file-exists? public-key)
+ (cond
+ ((zero? (system* (string-append #$openssl "/bin/openssl")
+ "req" "-new" "-x509" "-key" private-key
+ "-out" public-key "-days" "3650"
+ "-batch" "-subj" subject))
+ (chown public-key (passwd:uid owner) (passwd:gid owner))
+ (chmod public-key #o444))
+ (else
+ (format (current-error-port)
+ "Failed to create public key at ~a.\n" public-key)))))
+ (let ((user (getpwnam "dovecot")))
+ (mkdir-p/perms "/var/run/dovecot" user #o755)
+ (mkdir-p/perms "/var/lib/dovecot" user #o755)
+ (mkdir-p/perms "/etc/dovecot" user #o755)
+ (mkdir-p/perms "/etc/dovecot/private" user #o700)
+ (create-self-signed-certificate-if-absent
+ #:private-key "/etc/dovecot/private/default.pem"
+ #:public-key "/etc/dovecot/default.pem"
+ #:owner (getpwnam "root")
+ #:common-name (format #f "Dovecot service on ~a" (gethostname))))))
+
+(define (dovecot-dmd-service config)
+ "Return a list of <dmd-service> for CONFIG."
+ (let* ((config-str
+ (cond
+ ((opaque-dovecot-configuration? config)
+ (opaque-dovecot-configuration-string config))
+ (else
+ (with-output-to-string
+ (lambda ()
+ (serialize-configuration config
+ dovecot-configuration-fields))))))
+ (config-file (plain-file "dovecot.conf" config-str))
+ (dovecot (if (opaque-dovecot-configuration? config)
+ (opaque-dovecot-configuration-dovecot config)
+ (dovecot-configuration-dovecot config))))
+ (list (dmd-service
+ (documentation "Run the Dovecot POP3/IMAP mail server.")
+ (provision '(dovecot))
+ (requirement '(networking))
+ (start #~(make-forkexec-constructor
+ (list (string-append #$dovecot "/sbin/dovecot")
+ "-F" "-c" #$config-file)))
+ (stop #~(make-forkexec-constructor
+ (list (string-append #$dovecot "/sbin/dovecot")
+ "-c" #$config-file "stop")))))))
+
+(define %dovecot-pam-services
+ (list (unix-pam-service "dovecot")))
+
+(define dovecot-service-type
+ (service-type (name 'dovecot)
+ (extensions
+ (list (service-extension dmd-root-service-type
+ dovecot-dmd-service)
+ (service-extension account-service-type
+ (const %dovecot-accounts))
+ (service-extension pam-root-service-type
+ (const %dovecot-pam-services))
+ (service-extension activation-service-type
+ (const %dovecot-activation))))))
+
+(define* (dovecot-service #:key (config (dovecot-configuration)))
+ "Return a service that runs @command{dovecot}, a mail server that can run
+POP3, IMAP, and LMTP. @var{config} should be a configuration object created
+by @code{dovecot-configuration}. @var{config} may also be created by
+@code{opaque-dovecot-configuration}, which allows specification of the
+@code{dovecot.conf} as a string."
+ (validate-configuration config
+ (if (opaque-dovecot-configuration? config)
+ opaque-dovecot-configuration-fields
+ dovecot-configuration-fields))
+ (service dovecot-service-type config))
+
+;; A little helper to make it easier to document all those fields.
+(define (generate-documentation)
+ (define documentation
+ `((dovecot-configuration
+ ,dovecot-configuration-fields
+ (dict dict-configuration)
+ (namespaces namespace-configuration)
+ (plugin plugin-configuration)
+ (passdbs passdb-configuration)
+ (userdbs userdb-configuration)
+ (services service-configuration)
+ (protocols protocol-configuration))
+ (dict-configuration ,dict-configuration-fields)
+ (plugin-configuration ,plugin-configuration-fields)
+ (passdb-configuration ,passdb-configuration-fields)
+ (userdb-configuration ,userdb-configuration-fields)
+ (unix-listener-configuration ,unix-listener-configuration-fields)
+ (fifo-listener-configuration ,fifo-listener-configuration-fields)
+ (inet-listener-configuration ,inet-listener-configuration-fields)
+ (namespace-configuration
+ ,namespace-configuration-fields
+ (mailboxes mailbox-configuration))
+ (mailbox-configuration ,mailbox-configuration-fields)
+ (service-configuration
+ ,service-configuration-fields
+ (listeners unix-listener-configuration fifo-listener-configuration
+ inet-listener-configuration))
+ (protocol-configuration ,protocol-configuration-fields)))
+ (define (generate configuration-name)
+ (match (assq-ref documentation configuration-name)
+ ((fields . sub-documentation)
+ (format #t "\nAvailable @code{~a} fields are:\n\n" configuration-name)
+ (for-each
+ (lambda (f)
+ (let ((field-name (configuration-field-name f))
+ (field-type (configuration-field-type f))
+ (field-docs (string-trim-both
+ (configuration-field-documentation f)))
+ (default (catch #t
+ (configuration-field-default-value-thunk f)
+ (lambda _ 'nope))))
+ (define (escape-chars str chars escape)
+ (with-output-to-string
+ (lambda ()
+ (string-for-each (lambda (c)
+ (when (char-set-contains? chars c)
+ (display escape))
+ (display c))
+ str))))
+ (define (show-default? val)
+ (or (string? default) (number? default) (boolean? default)
+ (and (list? val) (and-map show-default? val))))
+ (format #t "@deftypevr {@code{~a} parameter} ~a ~a\n~a\n"
+ configuration-name field-type field-name field-docs)
+ (when (show-default? default)
+ (format #t "Defaults to @samp{~a}.\n"
+ (escape-chars (format #f "~s" default)
+ (char-set #\@ #\{ #\})
+ #\@)))
+ (for-each generate (or (assq-ref sub-documentation field-name) '()))
+ (format #t "@end deftypevr\n\n")))
+ fields))))
+ (generate 'dovecot-configuration))