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+<!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=utf-8">
+<title> Postfix manual - flush(8) </title>
+</head> <body> <pre>
+FLUSH(8) FLUSH(8)
+
+<b>NAME</b>
+ flush - Postfix fast flush server
+
+<b>SYNOPSIS</b>
+ <b>flush</b> [generic Postfix daemon options]
+
+<b>DESCRIPTION</b>
+ The <a href="flush.8.html"><b>flush</b>(8)</a> server maintains a record of deferred mail by destination.
+ This information is used to improve the performance of the SMTP <b>ETRN</b>
+ request, and of its command-line equivalent, "<b>sendmail -qR</b>" or
+ "<b>postqueue -f</b>". This program expects to be run from the <a href="master.8.html"><b>master</b>(8)</a>
+ process manager.
+
+ The record is implemented as a per-destination logfile with as contents
+ the queue IDs of deferred mail. A logfile is append-only, and is trun-
+ cated when delivery is requested for the corresponding destination. A
+ destination is the part on the right-hand side of the right-most <b>@</b> in
+ an email address.
+
+ Per-destination logfiles of deferred mail are maintained only for eli-
+ gible destinations. The list of eligible destinations is specified with
+ the <b><a href="postconf.5.html#fast_flush_domains">fast_flush_domains</a></b> configuration parameter, which defaults to
+ <b>$<a href="postconf.5.html#relay_domains">relay_domains</a></b>.
+
+ This server implements the following requests:
+
+ <b>add</b> <i>sitename queueid</i>
+ Inform the <a href="flush.8.html"><b>flush</b>(8)</a> server that the message with the specified
+ queue ID is queued for the specified destination.
+
+ <b>send_site</b> <i>sitename</i>
+ Request delivery of mail that is queued for the specified desti-
+ nation.
+
+ <b>send_file</b> <i>queueid</i>
+ Request delivery of the specified deferred message.
+
+ <b>refresh</b>
+ Refresh non-empty per-destination logfiles that were not read in
+ <b>$<a href="postconf.5.html#fast_flush_refresh_time">fast_flush_refresh_time</a></b> hours, by simulating send requests (see
+ above) for the corresponding destinations.
+
+ Delete empty per-destination logfiles that were not updated in
+ <b>$<a href="postconf.5.html#fast_flush_purge_time">fast_flush_purge_time</a></b> days.
+
+ This request completes in the background.
+
+ <b>purge</b> Do a <b>refresh</b> for all per-destination logfiles.
+
+<b>SECURITY</b>
+ The <a href="flush.8.html"><b>flush</b>(8)</a> server is not security-sensitive. It does not talk to the
+ network, and it does not talk to local users. The fast flush server
+ can run chrooted at fixed low privilege.
+
+<b>DIAGNOSTICS</b>
+ Problems and transactions are logged to <b>syslogd</b>(8) or <a href="postlogd.8.html"><b>postlogd</b>(8)</a>.
+
+<b>BUGS</b>
+ Fast flush logfiles are truncated only after a "send" request, not when
+ mail is actually delivered, and therefore can accumulate outdated or
+ redundant data. In order to maintain sanity, "refresh" must be executed
+ periodically. This can be automated with a suitable wakeup timer set-
+ ting in the <a href="master.5.html"><b>master.cf</b></a> configuration file.
+
+ Upon receipt of a request to deliver mail for an eligible destination,
+ the <a href="flush.8.html"><b>flush</b>(8)</a> server requests delivery of all messages that are listed
+ in that destination's logfile, regardless of the recipients of those
+ messages. This is not an issue for mail that is sent to a <b><a href="postconf.5.html#relay_domains">relay_domains</a></b>
+ destination because such mail typically only has recipients in one
+ domain.
+
+<b>CONFIGURATION PARAMETERS</b>
+ Changes to <a href="postconf.5.html"><b>main.cf</b></a> are picked up automatically as <a href="flush.8.html"><b>flush</b>(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"><b>postconf</b>(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 <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> con-
+ figuration 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#fast_flush_domains">fast_flush_domains</a> ($<a href="postconf.5.html#relay_domains">relay_domains</a>)</b>
+ Optional list of destinations that are eligible for per-destina-
+ tion logfiles with mail that is queued to those destinations.
+
+ <b><a href="postconf.5.html#fast_flush_refresh_time">fast_flush_refresh_time</a> (12h)</b>
+ The time after which a non-empty but unread per-destination
+ "fast flush" logfile needs to be refreshed.
+
+ <b><a href="postconf.5.html#fast_flush_purge_time">fast_flush_purge_time</a> (7d)</b>
+ The time after which an empty per-destination "fast flush" log-
+ file is deleted.
+
+ <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 an incoming connection before terminating voluntarily.
+
+ <b><a href="postconf.5.html#max_use">max_use</a> (100)</b>
+ The maximal number of incoming connections that a Postfix daemon
+ process will service before terminating voluntarily.
+
+ <b><a href="postconf.5.html#parent_domain_matches_subdomains">parent_domain_matches_subdomains</a> (see 'postconf -d' output)</b>
+ A list of Postfix features where the pattern "example.com" also
+ matches subdomains of example.com, instead of requiring an
+ explicit ".example.com" pattern.
+
+ <b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b>
+ The process ID of a Postfix command or daemon process.
+
+ <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 directory.
+
+ <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> (see 'postconf -d' output)</b>
+ A prefix that is prepended to the process name in syslog
+ records, so that, for example, "smtpd" becomes "prefix/smtpd".
+
+ Available in Postfix 3.3 and later:
+
+ <b><a href="postconf.5.html#service_name">service_name</a> (read-only)</b>
+ The <a href="master.5.html">master.cf</a> service name of a Postfix daemon process.
+
+<b>FILES</b>
+ /var/spool/postfix/flush, "fast flush" logfiles.
+
+<b>SEE ALSO</b>
+ <a href="smtpd.8.html">smtpd(8)</a>, SMTP server
+ <a href="qmgr.8.html">qmgr(8)</a>, queue manager
+ <a href="postconf.5.html">postconf(5)</a>, configuration parameters
+ <a href="master.5.html">master(5)</a>, generic daemon options
+ <a href="master.8.html">master(8)</a>, process manager
+ <a href="postlogd.8.html">postlogd(8)</a>, Postfix logging
+ syslogd(8), system logging
+
+<b>README FILES</b>
+ <a href="ETRN_README.html">ETRN_README</a>, Postfix ETRN howto
+
+<b>LICENSE</b>
+ The Secure Mailer license must be distributed with this software.
+
+<b>HISTORY</b>
+ This service was introduced with Postfix version 1.0.
+
+<b>AUTHOR(S)</b>
+ Wietse Venema
+ IBM T.J. Watson Research
+ P.O. Box 704
+ Yorktown Heights, NY 10598, USA
+
+ Wietse Venema
+ Google, Inc.
+ 111 8th Avenue
+ New York, NY 10011, USA
+
+ FLUSH(8)
+</pre> </body> </html>