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.
       It is the program that emulates the sendmail `mailq'  com‐
       mand.

       The showq(8) 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(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 ser‐
       vice can be susceptible to denial of service attacks.

STANDARDS
       None. The showq(8) daemon does not interact with the  out‐
       side 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 configuration 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 duplicate filter  for  aliases(5)  or  vir
              tual(5) alias expansion, or for showq(8) queue dis‐
              plays.

       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 termi‐
              nating 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  direc‐
              tory.

       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, "postfix/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)