    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).

    BUGS
           The showq(8) daemon runs at a fixed low privilege;  conse-
           quently, 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 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 the next  service  request
                  before exiting.

           max_use (100)
                  The  maximal number of connection requests before a
                  Postfix daemon 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  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)