smmapd - Cyrus IMAP documentation

       The Cyrus Team, Nic Bernstein (Onlight)

       1993–2025, The Cyrus Team

3.10.2                                            Jun 27, 2025                                         SMMAPD(8)

smmapd  is  a  Sendmail socket map daemon which is used to verify that a Cyrus mailbox exists, that it is
       postable 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 service ignores the userdeny database.  The received queries contain map name  followed  by  mailbox,
       smmapd  ignores  the map name.  Queries with plus addressing return OK if 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 - case-insensitive.

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

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
              smmapcmd="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

       smmapd - Cyrus IMAP documentation

       Sendmail socket map daemon

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

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

       -Ttimeout
              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.

       -D     Run external debugger specified in debug_command.

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

smmapd [ -Cconfig-file ]  [ -Uuses ] [ -Ttimeout ] [ -D ]