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FLUSH(8)							      FLUSH(8)

NAME
       flush - Postfix fast flush server

SYNOPSIS
       flush [generic Postfix daemon options]

DESCRIPTION
       The flush(8) server maintains a record of deferred mail by destination.
       This information is used to improve the performance of  the  SMTP  ETRN
       request,	  and  of  its	command-line  equivalent,  "sendmail  -qR"  or
       "postqueue -f".	This program expects to	 be  run  from	the  master(8)
       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	 @  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  fast_flush_domains	configuration  parameter,  which  defaults  to
       $relay_domains.

       This server implements the following requests:

       add sitename queueid
	      Inform the flush(8) server that the message with	the  specified
	      queue ID is queued for the specified destination.

       send_site sitename
	      Request delivery of mail that is queued for the specified desti‐
	      nation.

       send_file queueid
	      Request delivery of the specified deferred message.

       refresh
	      Refresh non-empty per-destination logfiles that were not read in
	      $fast_flush_refresh_time hours, by simulating send requests (see
	      above) for the corresponding destinations.

	      Delete empty per-destination logfiles that were not  updated  in
	      $fast_flush_purge_time days.

	      This request completes in the background.

       purge  Do a refresh for all per-destination logfiles.

SECURITY
       The  flush(8) 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.

DIAGNOSTICS
       Problems and transactions are logged to syslogd(8).

BUGS
       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       mail is actually delivered, and therefore can  accumulate  outdated  or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 master.cf configuration file.

       Upon  receipt of a request to deliver mail for an eligible destination,
       the flush(8) 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 relay_domains
       destination  because  such  mail	 typically  only has recipients in one
       domain.

CONFIGURATION PARAMETERS
       Changes to main.cf are picked up automatically  as  flush(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.

       fast_flush_domains ($relay_domains)
	      Optional list of destinations that are eligible for per-destina‐
	      tion logfiles with mail that is queued to those destinations.

       fast_flush_refresh_time (12h)
	      The time after which  a  non-empty  but  unread  per-destination
	      "fast flush" logfile needs to be refreshed.

       fast_flush_purge_time (7d)
	      The  time after which an empty per-destination "fast flush" log‐
	      file is deleted.

       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.

       parent_domain_matches_subdomains (see 'postconf -d' output)
	      What Postfix features match subdomains of "domain.tld" automati‐
	      cally, instead of requiring an explicit ".domain.tld" pattern.

       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, "post‐
	      fix/smtpd".

FILES
       /var/spool/postfix/flush, "fast flush" logfiles.

SEE ALSO
       smtpd(8), SMTP server
       qmgr(8), queue manager
       postconf(5), configuration parameters
       master(5), generic daemon options
       master(8), process manager
       syslogd(8), system logging

README FILES
       Use "postconf readme_directory" or "postconf html_directory" to	locate
       this information.
       ETRN_README, Postfix ETRN howto

LICENSE
       The Secure Mailer license must be distributed with this software.

HISTORY
       This service was introduced with Postfix version 1.0.

AUTHOR(S)
       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA

								      FLUSH(8)
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