    SHOWQ(8)                                                              SHOWQ(8)

    NAME
           showq - list the Postfix mail queue

    SYNOPSIS
           showq [generic Postfix daemon options]

    DESCRIPTION
           The  showq(8) daemon reports the Postfix mail queue status.  The output
           is meant to be formatted by the postqueue(1) command,  as  it  emulates
           the Sendmail `mailq' command.

           The  showq(8)  daemon  can also be run in stand-alone mode by the supe-
           ruser. This mode of operation is used to emulate  the  `mailq'  command
           while the Postfix mail system is down.

    SECURITY
           The  showq(8)  daemon  can run in a chroot jail at fixed low privilege,
           and takes no input from the client. Its service port is  accessible  to
           local  untrusted  users, so the service can be susceptible to denial of
           service attacks.

    STANDARDS
           None. The showq(8) daemon does not interact with the outside world.

    DIAGNOSTICS
           Problems and transactions are logged to syslogd(8).

    CONFIGURATION PARAMETERS
           Changes to main.cf are picked up automatically  as  showq(8)  processes
           run for only a limited amount of time. Use the command "postfix reload"
           to speed up a change.

           The text below provides only a parameter summary. See  postconf(5)  for
           more details including examples.

           config_directory (see 'postconf -d' output)
                  The  default  location of the Postfix main.cf and master.cf con-
                  figuration files.

           daemon_timeout (18000s)
                  How much time a Postfix daemon process  may  take  to  handle  a
                  request before it is terminated by a built-in watchdog timer.

           duplicate_filter_limit (1000)
                  The maximal number of addresses remembered by the address dupli-
                  cate filter for aliases(5) or virtual(5) alias expansion, or for
                  showq(8) queue displays.

           empty_address_recipient (MAILER-DAEMON)
                  The recipient of mail addressed to the null address.

           ipc_timeout (3600s)
                  The  time  limit  for  sending  or receiving information over an
                  internal communication channel.

           max_idle (100s)
                  The maximum amount of time that an idle Postfix  daemon  process
                  waits for an incoming connection before terminating voluntarily.

           max_use (100)
                  The maximal number of incoming connections that a Postfix daemon
                  process will service before terminating voluntarily.

           process_id (read-only)
                  The process ID of a Postfix command or daemon process.

           process_name (read-only)
                  The process name of a Postfix command or daemon process.

           queue_directory (see 'postconf -d' output)
                  The location of the Postfix top-level queue directory.

           syslog_facility (mail)
                  The syslog facility of Postfix logging.

           syslog_name (see 'postconf -d' output)
                  A  prefix  that  is  prepended  to  the  process  name in syslog
                  records, so that, for example, "smtpd" becomes "prefix/smtpd".

           Available in Postfix version 2.9 and later:

           enable_long_queue_ids (no)
                  Enable long, non-repeating, queue IDs (queue file names).

           Available in Postfix 3.3 and later:

           service_name (read-only)
                  The master.cf service name of a Postfix daemon process.

    FILES
           /var/spool/postfix, queue directories

    SEE ALSO
           pickup(8), local mail pickup service
           cleanup(8), canonicalize and enqueue mail
           qmgr(8), queue manager
           postconf(5), configuration parameters
           master(8), process manager
           syslogd(8), system logging

    LICENSE
           The Secure Mailer license must be distributed with this software.

    AUTHOR(S)
           Wietse Venema
           IBM T.J. Watson Research
           P.O. Box 704
           Yorktown Heights, NY 10598, USA

           Wietse Venema
           Google, Inc.
           111 8th Avenue
           New York, NY 10011, USA

                                                                          SHOWQ(8)