SHOWQ(8)SHOWQ(8)NAMEshowq - list the Postfix mail queue
SYNOPSISshowq [generic Postfix daemon options]
DESCRIPTION
The showq(8) daemon reports the Postfix mail queue status. It is the
program that 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).
BUGS
The showq(8) 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 ALSOpickup(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)
