showq(8postfix) [linux man page]
SHOWQ(8postfix) SHOWQ(8postfix) 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' command. 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 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). 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 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 an incoming connection before terminating voluntarily. max_use(100) The maximal number of incoming connections that a Postfix daemon process will service before terminating 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 directory. syslog_facility (mail) The syslog facility of Postfix logging. syslog_name (see 'postconf -d' output) 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(8postfix)
Check Out this Related Man Page
PICKUP(8postfix) PICKUP(8postfix) NAME
pickup - Postfix local mail pickup SYNOPSIS
pickup [generic Postfix daemon options] DESCRIPTION
The pickup(8) daemon waits for hints that new mail has been dropped into the maildrop directory, and feeds it into the cleanup(8) daemon. Ill-formatted files are deleted without notifying the originator. This program expects to be run from the master(8) process manager. STANDARDS
None. The pickup(8) daemon does not interact with the outside world. SECURITY
The pickup(8) daemon is moderately security sensitive. It runs with fixed low privilege and can run in a chrooted environment. However, the program reads files from potentially hostile users. The pickup(8) daemon opens no files for writing, is careful about what files it opens for reading, and does not actually touch any data that is sent to its public service endpoint. DIAGNOSTICS
Problems and transactions are logged to syslogd(8). BUGS
The pickup(8) daemon copies mail from file to the cleanup(8) daemon. It could avoid message copying overhead by sending a file descriptor instead of file data, but then the already complex cleanup(8) daemon would have to deal with unfiltered user data. CONFIGURATION PARAMETERS
As the pickup(8) daemon is a relatively long-running process, up to an hour may pass before a main.cf change takes effect. Use the command "postfix reload" command to speed up a change. The text below provides only a parameter summary. See postconf(5) for more details including examples. CONTENT INSPECTION CONTROLS
content_filter (empty) After the message is queued, send the entire message to the specified transport:destination. receive_override_options (empty) Enable or disable recipient validation, built-in content filtering, or address mapping. MISCELLANEOUS CONTROLS
config_directory (see 'postconf -d' output) The default location of the Postfix main.cf and master.cf configuration files. ipc_timeout(3600s) The time limit for sending or receiving information over an internal communication channel. line_length_limit(2048) Upon input, long lines are chopped up into pieces of at most this length; upon delivery, long lines are reconstructed. 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 terminating 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 directory. syslog_facility (mail) The syslog facility of Postfix logging. syslog_name (see 'postconf -d' output) The mail system name that is prepended to the process name in syslog records, so that "smtpd" becomes, for example, "postfix/smtpd". SEE ALSO
cleanup(8), message canonicalization sendmail(1), Sendmail-compatible interface postdrop(1), mail posting agent postconf(5), configuration parameters master(5), generic daemon options 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 PICKUP(8postfix)