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smmapd

Cyrus IMAP documentation Sendmail and Postfix socket map daemon

smmapd [ -C config-file ]  [ -U uses ] [ -T timeout ] [ -D ] [-p]


smmapd is a Sendmail and Postfix socket map daemon which is used to verify that a Cyrus mailbox exists, that it is postable, it is not blocked for the smmapd service in the userdeny database, and it is under quota. It accepts commands on its standard input and responds on its standard output. It MUST be invoked by master(8) with those descriptors attached to a remote client connection. The received queries contain map name followed by mailbox, smmapd ignores the map name. Queries with plus addressing, when -p is not passed, return OK when the user has a mailbox with the name after plus, otherwise the result is NOTFOUND. Match for the mailbox after plus is performed case-sensitive, for the address before the plus - depends on lmtp_downcase_rcpt.

The use case is to verify in Sendmail or Postfix if the destination exists, before accepting an email. Then, if autocreate_sieve_folders is set, but the folder does not exist yet, smmapd will return NOTFOUND, unless -p is passed. Another use case is to do something in a Sieve script with emails, based on plus addressing, without delivering them in the correspondent sub-folder. To accept such emails, when the folder with the same name does not exist, -p must be passed.

smmapd reads its configuration options out of the imapd.conf(5) file unless specified otherwise by -C.

Use the specified configuration file config-file rather than the default imapd.conf(5).

The maximum number of times that the process should be used for new connections before shutting down. The default is 250.

The number of seconds that the process will wait for a new connection before shutting down. Note that a value of 0 (zero) will disable the timeout. The default is 60.

Run external debugger specified in debug_command.

Skip plus addressing: everything from + until @. When looking up the userdeny database, plus addressing is always skipped, irrespective of this option.

smmapd is commonly included in the SERVICES section of cyrus.conf(5) like so:

SERVICES {
    imap        cmd="imapd -U 30" listen="imap" prefork=0
    imaps       cmd="imapd -s -U 30" listen="imaps" prefork=0 maxchild=100
    lmtpunix    cmd="lmtpd" listen="/var/run/cyrus/socket/lmtp" prefork=0 maxchild=20
    smmap       cmd="smmapd" listen="/var/run/cyrus/socket/smmap" prefork=0
    sieve       cmd="timsieved" listen="sieve" prefork=0
    notify      cmd="notifyd" listen="/var/run/cyrus/socket/notify" proto="udp" prefork=1
    httpd       cmd="httpd" listen=8080 prefork=1 maxchild=20
}


/etc/imapd.conf, /etc/cyrus.conf

imapd.conf(5), cyrus.conf(5)

The Cyrus Team, Nic Bernstein (Onlight)

1993–2025, The Cyrus Team