<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <title> Postfix manual - showq(8) </title> </head> <body> <pre> SHOWQ(8) SHOWQ(8) <b>NAME</b> showq - list the Postfix mail queue <b>SYNOPSIS</b> <b>showq</b> [generic Postfix daemon options] <b>DESCRIPTION</b> The <b>showq</b> daemon reports the Postfix mail queue status. It is the program that emulates the sendmail `mailq' com- mand. The <b>showq</b> 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. <b>SECURITY</b> The <b>showq</b> 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. <b>STANDARDS</b> None. The showq daemon does not interact with the outside world. <b>DIAGNOSTICS</b> Problems and transactions are logged to <b>syslogd</b>(8). <b>BUGS</b> The <b>showq</b> daemon runs at a fixed low privilege; conse- quently, it cannot extract information from queue files in the <b>maildrop</b> directory. <b>CONFIGURATION PARAMETERS</b> Changes to <b>main.cf</b> are picked up automatically as <a href="showq.8.html">showq(8)</a> processes run for only a limited amount of time. Use the command "<b>postfix reload</b>" to speed up a change. The text below provides only a parameter summary. See <a href="postconf.5.html">postconf(5)</a> for more details including examples. <b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b> The default location of the Postfix main.cf and master.cf configuration files. <b><a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)</b> How much time a Postfix daemon process may take to handle a request before it is terminated by a built-in watchdog timer. <b><a href="postconf.5.html#duplicate_filter_limit">duplicate_filter_limit</a> (1000)</b> The maximal number of addresses remembered by the address duplicate filter for <a href="aliases.5.html">aliases(5)</a> or vir- tual(5) alias expansion, or for <a href="showq.8.html">showq(8)</a> queue dis- plays. <b><a href="postconf.5.html#empty_address_recipient">empty_address_recipient</a> (MAILER-DAEMON)</b> The recipient of mail addressed to the null address. <b><a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)</b> The time limit for sending or receiving information over an internal communication channel. <b><a href="postconf.5.html#max_idle">max_idle</a> (100s)</b> The maximum amount of time that an idle Postfix daemon process waits for the next service request before exiting. <b><a href="postconf.5.html#max_use">max_use</a> (100)</b> The maximal number of connection requests before a Postfix daemon process terminates. <b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b> The process ID of a Postfix command or daemon pro- cess. <b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b> The process name of a Postfix command or daemon process. <b><a href="postconf.5.html#queue_directory">queue_directory</a> (see 'postconf -d' output)</b> The location of the Postfix top-level queue direc- tory. <b><a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)</b> The syslog facility of Postfix logging. <b><a href="postconf.5.html#syslog_name">syslog_name</a> (postfix)</b> The mail system name that is prepended to the pro- cess name in syslog records, so that "smtpd" becomes, for example, "postfix/smtpd". <b>FILES</b> /var/spool/postfix, queue directories <b>SEE ALSO</b> <a href="pickup.8.html">pickup(8)</a>, local mail pickup service <a href="cleanup.8.html">cleanup(8)</a>, canonicalize and enqueue mail <a href="qmgr.8.html">qmgr(8)</a>, queue manager <a href="postconf.5.html">postconf(5)</a>, configuration parameters <a href="master.8.html">master(8)</a>, process manager syslogd(8), system logging <b>LICENSE</b> The Secure Mailer license must be distributed with this software. <b>AUTHOR(S)</b> Wietse Venema IBM T.J. Watson Research P.O. Box 704 Yorktown Heights, NY 10598, USA SHOWQ(8) </pre> </body> </html>