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SHOWQ(8)                    System Manager's Manual                   SHOWQ(8)



NAME
       showq - list the Postfix mail queue

SYNOPSIS
       showq [generic Postfix daemon options]

DESCRIPTION
       The showq daemon reports the Postfix mail queue status.  It is the pro-
       gram that emulates the sendmail `mailq' command.

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

SECURITY
       The showq 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 daemon does not interact with the outside world.

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

BUGS
       The showq daemon runs at a fixed low privilege; consequently, it cannot
       extract information from queue files in the maildrop directory.

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 the next service request before exiting.

       max_use (100)
              The  maximal number of connection requests before a Postfix dae-
              mon process terminates.

       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 (postfix)
              The mail system name that is prepended to the  process  name  in
              syslog  records,  so  that  "smtpd" becomes, for example, "post-
              fix/smtpd".

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



                                                                      SHOWQ(8)