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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">
<link rel='stylesheet' type='text/css' href='postfix-doc.css'>
<title> Postfix manual - postfix(1) </title>
</head> <body> <pre>
POSTFIX(1) POSTFIX(1)
<b>NAME</b>
postfix - Postfix control program
<b>SYNOPSIS</b>
<b>postfix</b> [<b>-Dv</b>] [<b>-c</b> <i>config</i><b>_</b><i>dir</i>] <i>command</i>
<b>DESCRIPTION</b>
This command is reserved for the superuser. To submit mail, use the
Postfix <a href="sendmail.1.html"><b>sendmail</b>(1)</a> command.
The <a href="postfix.1.html"><b>postfix</b>(1)</a> command controls the operation of the Postfix mail sys-
tem: start or stop the <a href="master.8.html"><b>master</b>(8)</a> daemon, do a health check, and other
maintenance.
By default, the <a href="postfix.1.html"><b>postfix</b>(1)</a> command sets up a standardized environment
and runs the <b>postfix-script</b> shell script to do the actual work.
However, when support for multiple Postfix instances is configured,
<a href="postfix.1.html"><b>postfix</b>(1)</a> executes the command specified with the <b><a href="postconf.5.html#multi_instance_wrapper">multi_instance_wrap</a>-</b>
<b><a href="postconf.5.html#multi_instance_wrapper">per</a></b> configuration parameter. This command will execute the <i>command</i> for
each applicable Postfix instance.
The following commands are implemented:
<b>check</b> Warn about bad directory/file ownership or permissions, and cre-
ate missing directories.
<b>start</b> Start the Postfix mail system. This also runs the configuration
check described above.
<b>start-fg</b>
Like <b>start</b>, but keep the <a href="master.8.html"><b>master</b>(8)</a> daemon running in the fore-
ground, and enable <a href="master.8.html"><b>master</b>(8)</a> "init" mode when running as PID 1.
This command requires that multi-instance support is disabled
(i.e. the <a href="postconf.5.html#multi_instance_directories">multi_instance_directories</a> parameter value must be
empty).
When running Postfix inside a container, see <a href="MAILLOG_README.html">MAILLOG_README</a> for
logging to stdout. Postfix logs to syslog by default, which
requires a) running a syslogd process inside the container, or
b) mounting the container host's /dev/log socket inside the con-
tainer (example: "docker run -v /dev/log:/dev/log ..."), and c)
a distinct Postfix "<a href="postconf.5.html#syslog_name">syslog_name</a>" prefix that identifies logging
from the Postfix instance.
<b>stop</b> Stop the Postfix mail system in an orderly fashion. If possible,
running processes are allowed to terminate at their earliest
convenience.
Note: in order to refresh the Postfix mail system after a con-
figuration change, do not use the <b>start</b> and <b>stop</b> commands in
succession. Use the <b>reload</b> command instead.
<b>abort</b> Stop the Postfix mail system abruptly. Running processes are
signaled to stop immediately.
<b>flush</b> Force delivery: attempt to deliver every message in the deferred
mail queue. Normally, attempts to deliver delayed mail happen at
regular intervals, the interval doubling after each failed
attempt.
Warning: flushing undeliverable mail frequently will result in
poor delivery performance of all other mail.
<b>reload</b> Re-read configuration files. Running processes terminate at
their earliest convenience.
<b>status</b> Indicate if the Postfix mail system is currently running (zero
exit status) or stopped (non-zero exit status).
<b>set-permissions</b> [<i>name</i>=<i>value ...</i>]
Set the ownership and permissions of Postfix related files and
directories, as specified in the <b>postfix-files</b> file.
Specify <i>name</i>=<i>value</i> to override and update specific <a href="postconf.5.html">main.cf</a> con-
figuration parameters. Use this, for example, to change the
<b><a href="postconf.5.html#mail_owner">mail_owner</a></b> or <b><a href="postconf.5.html#setgid_group">setgid_group</a></b> setting for an already installed
Postfix system.
This feature is available in Postfix 2.1 and later. With Post-
fix 2.0 and earlier, use "<b>$<a href="postconf.5.html#config_directory">config_directory</a>/post-install</b>
<b>set-permissions</b>".
<b>logrotate</b>
Rotate the logfile specified with $<a href="postconf.5.html#maillog_file">maillog_file</a>, by appending a
time-stamp suffix that is formatted according to $<a href="postconf.5.html#maillog_file_rotate_suffix">mail</a>-
<a href="postconf.5.html#maillog_file_rotate_suffix">log_file_rotate_suffix</a>, and by compressing the file with the
command specified with $<a href="postconf.5.html#maillog_file_compressor">maillog_file_compressor</a>. This will not
rotate /dev/* files.
This feature is available in Postfix 3.4 and later.
<b>tls</b> <i>subcommand</i>
Enable opportunistic TLS in the Postfix SMTP client or server,
and manage Postfix SMTP server TLS private keys and certifi-
cates. See <a href="postfix-tls.1.html">postfix-tls(1)</a> for documentation.
This feature is available in Postfix 3.1 and later.
<b>upgrade-configuration</b> [<i>name</i>=<i>value ...</i>]
Update the <a href="postconf.5.html"><b>main.cf</b></a> and <a href="master.5.html"><b>master.cf</b></a> files with information that
Postfix needs in order to run: add or update services, and add
or update configuration parameter settings.
Specify <i>name</i>=<i>value</i> to override and update specific <a href="postconf.5.html">main.cf</a> con-
figuration parameters.
This feature is available in Postfix 2.1 and later. With Post-
fix 2.0 and earlier, use "<b>$<a href="postconf.5.html#config_directory">config_directory</a>/post-install</b>
<b>upgrade-configuration</b>".
The following options are implemented:
<b>-c</b> <i>config</i><b>_</b><i>dir</i>
Read the <a href="postconf.5.html"><b>main.cf</b></a> and <a href="master.5.html"><b>master.cf</b></a> configuration files in the named
directory instead of the default configuration directory. Use
this to distinguish between multiple Postfix instances on the
same host.
With Postfix 2.6 and later, this option forces the <a href="postfix.1.html">postfix(1)</a>
command to operate on the specified Postfix instance only. This
behavior is inherited by <a href="postfix.1.html">postfix(1)</a> commands that run as a
descendant of the current process.
<b>-D</b> (with <b>postfix start</b> only)
Run each Postfix daemon under control of a debugger as specified
via the <b><a href="postconf.5.html#debugger_command">debugger_command</a></b> configuration parameter.
<b>-v</b> Enable verbose logging for debugging purposes. Multiple <b>-v</b>
options make the software increasingly verbose.
<b>ENVIRONMENT</b>
The <a href="postfix.1.html"><b>postfix</b>(1)</a> command exports the following environment variables
before executing the <b>postfix-script</b> file:
<b>MAIL_CONFIG</b>
This is set when the -c command-line option is present.
With Postfix 2.6 and later, this environment variable forces the
<a href="postfix.1.html">postfix(1)</a> command to operate on the specified Postfix instance
only. This behavior is inherited by <a href="postfix.1.html">postfix(1)</a> commands that
run as a descendant of the current process.
<b>MAIL_VERBOSE</b>
This is set when the -v command-line option is present.
<b>MAIL_DEBUG</b>
This is set when the -D command-line option is present.
When the internal logging service is enabled (by setting a non-empty
<a href="postconf.5.html#maillog_file">maillog_file</a> parameter value) the <a href="postfix.1.html">postfix(1)</a> command exports settings
that are used by child processes before they have processed <a href="postconf.5.html">main.cf</a> or
command-line settings.
<b>POSTLOG_SERVICE</b>
The name of the public postlog service endpoint.
<b>POSTLOG_HOSTNAME</b>
The hostname to prepend to internal logging.
<b>CONFIGURATION PARAMETERS</b>
The following <a href="postconf.5.html"><b>main.cf</b></a> configuration parameters are exported as environ-
ment variables with the same names:
<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#command_directory">command_directory</a> (see 'postconf -d' output)</b>
The location of all postfix administrative commands.
<b><a href="postconf.5.html#daemon_directory">daemon_directory</a> (see 'postconf -d' output)</b>
The directory with Postfix support programs and daemon programs.
<b><a href="postconf.5.html#html_directory">html_directory</a> (see 'postconf -d' output)</b>
The location of Postfix HTML files that describe how to build,
configure or operate a specific Postfix subsystem or feature.
<b><a href="postconf.5.html#mail_owner">mail_owner</a> (postfix)</b>
The UNIX system account that owns the Postfix queue and most
Postfix daemon processes.
<b><a href="postconf.5.html#mailq_path">mailq_path</a> (see 'postconf -d' output)</b>
Sendmail compatibility feature that specifies where the Postfix
<a href="mailq.1.html"><b>mailq</b>(1)</a> command is installed.
<b><a href="postconf.5.html#manpage_directory">manpage_directory</a> (see 'postconf -d' output)</b>
Where the Postfix manual pages are installed.
<b><a href="postconf.5.html#newaliases_path">newaliases_path</a> (see 'postconf -d' output)</b>
Sendmail compatibility feature that specifies the location of
the <a href="newaliases.1.html"><b>newaliases</b>(1)</a> command.
<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#readme_directory">readme_directory</a> (see 'postconf -d' output)</b>
The location of Postfix README files that describe how to build,
configure or operate a specific Postfix subsystem or feature.
<b><a href="postconf.5.html#sendmail_path">sendmail_path</a> (see 'postconf -d' output)</b>
A Sendmail compatibility feature that specifies the location of
the Postfix <a href="sendmail.1.html"><b>sendmail</b>(1)</a> command.
<b><a href="postconf.5.html#setgid_group">setgid_group</a> (postdrop)</b>
The group ownership of set-gid Postfix commands and of
group-writable Postfix directories.
Available in Postfix version 2.5 and later:
<b><a href="postconf.5.html#data_directory">data_directory</a> (see 'postconf -d' output)</b>
The directory with Postfix-writable data files (for example:
caches, pseudo-random numbers).
Available in Postfix version 3.0 and later:
<b><a href="postconf.5.html#compatibility_level">compatibility_level</a> (0)</b>
A safety net that causes Postfix to run with backwards-compati-
ble default settings after an upgrade to a newer Postfix ver-
sion.
<b><a href="postconf.5.html#meta_directory">meta_directory</a> (see 'postconf -d' output)</b>
The location of non-executable files that are shared among mul-
tiple Postfix instances, such as postfix-files, dynamicmaps.cf,
and the multi-instance template files <a href="postconf.5.html">main.cf</a>.proto and <a href="master.5.html">mas-
ter.cf</a>.proto.
<b><a href="postconf.5.html#shlib_directory">shlib_directory</a> (see 'postconf -d' output)</b>
The location of Postfix dynamically-linked libraries (libpost-
fix-*.so), and the default location of Postfix database plugins
(postfix-*.so) that have a relative pathname in the dynam-
icmaps.cf file.
Available in Postfix version 3.1 and later:
<b><a href="postconf.5.html#openssl_path">openssl_path</a> (openssl)</b>
The location of the OpenSSL command line program <b>openssl</b>(1).
Other configuration parameters:
<b><a href="postconf.5.html#import_environment">import_environment</a> (see 'postconf -d' output)</b>
The list of environment variables that a privileged Postfix
process will import from a non-Postfix parent process, or
name=value environment overrides.
<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 version 2.6 and later:
<b><a href="postconf.5.html#multi_instance_directories">multi_instance_directories</a> (empty)</b>
An optional list of non-default Postfix configuration directo-
ries; these directories belong to additional Postfix instances
that share the Postfix executable files and documentation with
the default Postfix instance, and that are started, stopped,
etc., together with the default Postfix instance.
<b><a href="postconf.5.html#multi_instance_wrapper">multi_instance_wrapper</a> (empty)</b>
The pathname of a multi-instance manager command that the <a href="postfix.1.html"><b>post-</b></a>
<a href="postfix.1.html"><b>fix</b>(1)</a> command invokes when the <a href="postconf.5.html#multi_instance_directories">multi_instance_directories</a>
parameter value is non-empty.
<b><a href="postconf.5.html#multi_instance_group">multi_instance_group</a> (empty)</b>
The optional instance group name of this Postfix instance.
<b><a href="postconf.5.html#multi_instance_name">multi_instance_name</a> (empty)</b>
The optional instance name of this Postfix instance.
<b><a href="postconf.5.html#multi_instance_enable">multi_instance_enable</a> (no)</b>
Allow this Postfix instance to be started, stopped, etc., by a
multi-instance manager.
Available in Postfix version 3.4 and later:
<b><a href="postconf.5.html#maillog_file">maillog_file</a> (empty)</b>
The name of an optional logfile that is written by the Postfix
<a href="postlogd.8.html"><b>postlogd</b>(8)</a> service.
<b><a href="postconf.5.html#maillog_file_compressor">maillog_file_compressor</a> (gzip)</b>
The program to run after rotating $<a href="postconf.5.html#maillog_file">maillog_file</a> with "postfix
logrotate".
<b><a href="postconf.5.html#maillog_file_prefixes">maillog_file_prefixes</a> (/var, /dev/stdout)</b>
A list of allowed prefixes for a <a href="postconf.5.html#maillog_file">maillog_file</a> value.
<b><a href="postconf.5.html#maillog_file_rotate_suffix">maillog_file_rotate_suffix</a> (%Y%m%d-%H%M%S)</b>
The format of the suffix to append to $<a href="postconf.5.html#maillog_file">maillog_file</a> while rotat-
ing the file with "postfix logrotate".
<b><a href="postconf.5.html#postlog_service_name">postlog_service_name</a> (postlog)</b>
The name of the <a href="postlogd.8.html"><b>postlogd</b>(8)</a> service entry in <a href="master.5.html">master.cf</a>.
<b>FILES</b>
Prior to Postfix version 2.6, all of the following files were in <b>$<a href="postconf.5.html#config_directory">con</a>-</b>
<b><a href="postconf.5.html#config_directory">fig_directory</a></b>. Some files are now in <b>$<a href="postconf.5.html#daemon_directory">daemon_directory</a></b> or <b>$meta_direc-</b>
<b>tory</b> so that they can be shared among multiple instances that run the
same Postfix version.
Use the command "<b>postconf <a href="postconf.5.html#config_directory">config_directory</a></b>" or "<b>postconf <a href="postconf.5.html#daemon_directory">daemon_direc</a>-</b>
<b><a href="postconf.5.html#daemon_directory">tory</a></b>" to expand the names into their actual values.
$<a href="postconf.5.html#config_directory">config_directory</a>/<a href="postconf.5.html">main.cf</a>, Postfix configuration parameters
$<a href="postconf.5.html#config_directory">config_directory</a>/<a href="master.5.html">master.cf</a>, Postfix daemon processes
$<a href="postconf.5.html#daemon_directory">daemon_directory</a>/postfix-script, administrative commands
$<a href="postconf.5.html#daemon_directory">daemon_directory</a>/post-install, post-installation configuration
$<a href="postconf.5.html#meta_directory">meta_directory</a>/dynamicmaps.cf, plug-in database clients
$<a href="postconf.5.html#meta_directory">meta_directory</a>/postfix-files, file/directory permissions
<b>SEE ALSO</b>
Commands:
<a href="postalias.1.html">postalias(1)</a>, create/update/query alias database
<a href="postcat.1.html">postcat(1)</a>, examine Postfix queue file
<a href="postconf.1.html">postconf(1)</a>, Postfix configuration utility
<a href="postdrop.1.html">postdrop(1)</a>, Postfix mail posting utility
<a href="postfix.1.html">postfix(1)</a>, Postfix control program
<a href="postfix-tls.1.html">postfix-tls(1)</a>, Postfix TLS management
<a href="postkick.1.html">postkick(1)</a>, trigger Postfix daemon
<a href="postlock.1.html">postlock(1)</a>, Postfix-compatible locking
<a href="postlog.1.html">postlog(1)</a>, Postfix-compatible logging
<a href="postmap.1.html">postmap(1)</a>, Postfix lookup table manager
<a href="postmulti.1.html">postmulti(1)</a>, Postfix multi-instance manager
<a href="postqueue.1.html">postqueue(1)</a>, Postfix mail queue control
<a href="postsuper.1.html">postsuper(1)</a>, Postfix housekeeping
<a href="mailq.1.html">mailq(1)</a>, Sendmail compatibility interface
<a href="newaliases.1.html">newaliases(1)</a>, Sendmail compatibility interface
<a href="sendmail.1.html">sendmail(1)</a>, Sendmail compatibility interface
Postfix configuration:
<a href="bounce.5.html">bounce(5)</a>, Postfix bounce message templates
<a href="master.5.html">master(5)</a>, Postfix <a href="master.5.html">master.cf</a> file syntax
<a href="postconf.5.html">postconf(5)</a>, Postfix <a href="postconf.5.html">main.cf</a> file syntax
<a href="postfix-wrapper.5.html">postfix-wrapper(5)</a>, Postfix multi-instance API
Table-driven mechanisms:
<a href="access.5.html">access(5)</a>, Postfix SMTP access control table
<a href="aliases.5.html">aliases(5)</a>, Postfix <a href="ADDRESS_REWRITING_README.html#aliases">local aliasing</a>
<a href="canonical.5.html">canonical(5)</a>, Postfix input address rewriting
<a href="generic.5.html">generic(5)</a>, Postfix output address rewriting
<a href="header_checks.5.html">header_checks(5)</a>, <a href="header_checks.5.html">body_checks(5)</a>, Postfix content inspection
<a href="relocated.5.html">relocated(5)</a>, Users that have moved
<a href="transport.5.html">transport(5)</a>, Postfix routing table
<a href="virtual.5.html">virtual(5)</a>, Postfix <a href="ADDRESS_REWRITING_README.html#virtual">virtual aliasing</a>
Table lookup mechanisms:
<a href="cidr_table.5.html">cidr_table(5)</a>, Associate CIDR pattern with value
<a href="ldap_table.5.html">ldap_table(5)</a>, Postfix LDAP client
<a href="lmdb_table.5.html">lmdb_table(5)</a>, Postfix LMDB database driver
<a href="memcache_table.5.html">memcache_table(5)</a>, Postfix memcache client
<a href="mongodb_table.5.html">mongodb_table(5)</a>, Postfix MongoDB client
<a href="mysql_table.5.html">mysql_table(5)</a>, Postfix MYSQL client
<a href="nisplus_table.5.html">nisplus_table(5)</a>, Postfix NIS+ client
<a href="pcre_table.5.html">pcre_table(5)</a>, Associate PCRE pattern with value
<a href="pgsql_table.5.html">pgsql_table(5)</a>, Postfix PostgreSQL client
<a href="regexp_table.5.html">regexp_table(5)</a>, Associate POSIX regexp pattern with value
<a href="socketmap_table.5.html">socketmap_table(5)</a>, Postfix socketmap client
<a href="sqlite_table.5.html">sqlite_table(5)</a>, Postfix SQLite database driver
<a href="tcp_table.5.html">tcp_table(5)</a>, Postfix client-server table lookup
Daemon processes:
<a href="anvil.8.html">anvil(8)</a>, Postfix connection/rate limiting
<a href="bounce.8.html">bounce(8)</a>, <a href="defer.8.html">defer(8)</a>, <a href="trace.8.html">trace(8)</a>, Delivery status reports
<a href="cleanup.8.html">cleanup(8)</a>, canonicalize and enqueue message
<a href="discard.8.html">discard(8)</a>, Postfix discard delivery agent
<a href="dnsblog.8.html">dnsblog(8)</a>, DNS allow/denylist logger
<a href="error.8.html">error(8)</a>, Postfix error delivery agent
<a href="flush.8.html">flush(8)</a>, Postfix fast ETRN service
<a href="local.8.html">local(8)</a>, Postfix local delivery agent
<a href="master.8.html">master(8)</a>, Postfix master daemon
<a href="qmgr.8.html">oqmgr(8)</a>, old Postfix queue manager
<a href="pickup.8.html">pickup(8)</a>, Postfix local mail pickup
<a href="pipe.8.html">pipe(8)</a>, deliver mail to non-Postfix command
<a href="postlogd.8.html">postlogd(8)</a>, Postfix internal logging service
<a href="postscreen.8.html">postscreen(8)</a>, Postfix zombie blocker
<a href="proxymap.8.html">proxymap(8)</a>, Postfix lookup table proxy server
<a href="qmgr.8.html">qmgr(8)</a>, Postfix queue manager
<a href="qmqpd.8.html">qmqpd(8)</a>, Postfix QMQP server
<a href="scache.8.html">scache(8)</a>, Postfix connection cache manager
<a href="showq.8.html">showq(8)</a>, list Postfix mail queue
<a href="smtp.8.html">smtp(8)</a>, <a href="lmtp.8.html">lmtp(8)</a>, Postfix SMTP+LMTP client
<a href="smtpd.8.html">smtpd(8)</a>, Postfix SMTP server
<a href="spawn.8.html">spawn(8)</a>, run non-Postfix server
<a href="tlsmgr.8.html">tlsmgr(8)</a>, Postfix TLS cache and randomness manager
<a href="tlsproxy.8.html">tlsproxy(8)</a>, Postfix TLS proxy server
<a href="trivial-rewrite.8.html">trivial-rewrite(8)</a>, Postfix address rewriting
<a href="verify.8.html">verify(8)</a>, Postfix address verification
<a href="virtual.8.html">virtual(8)</a>, Postfix virtual delivery agent
Other:
syslogd(8), system logging
<b>README FILES</b>
<a href="OVERVIEW.html">OVERVIEW</a>, overview of Postfix commands and processes
<a href="BASIC_CONFIGURATION_README.html">BASIC_CONFIGURATION_README</a>, Postfix basic configuration
<a href="ADDRESS_REWRITING_README.html">ADDRESS_REWRITING_README</a>, Postfix address rewriting
<a href="SMTPD_ACCESS_README.html">SMTPD_ACCESS_README</a>, SMTP relay/access control
<a href="CONTENT_INSPECTION_README.html">CONTENT_INSPECTION_README</a>, Postfix content inspection
<a href="QSHAPE_README.html">QSHAPE_README</a>, Postfix queue analysis
<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
Wietse Venema
Google, Inc.
111 8th Avenue
New York, NY 10011, USA
TLS support by:
Lutz Jaenicke
Brandenburg University of Technology
Cottbus, Germany
Victor Duchovni
Morgan Stanley
SASL support originally by:
Till Franke
SuSE Rhein/Main AG
65760 Eschborn, Germany
LMTP support originally by:
Philip A. Prindeville
Mirapoint, Inc.
USA.
Amos Gouaux
University of Texas at Dallas
P.O. Box 830688, MC34
Richardson, TX 75083, USA
IPv6 support originally by:
Mark Huizer, Eindhoven University, The Netherlands
Jun-ichiro 'itojun' Hagino, KAME project, Japan
The Linux PLD project
Dean Strik, Eindhoven University, The Netherlands
POSTFIX(1)
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