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postconf - Postfix configuration utility
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<b>postconf</b> [<b>-dhnv</b>] [<b>-c</b> <i>config</i><b>_</b><i>dir</i>] [<i>parameter ...</i>]
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<b>Managing <a href="postconf.5.html">main.cf</a>:</b>
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<b>postconf</b> [<b>-aAmlv</b>] [<b>-c</b> <i>config</i><b>_</b><i>dir</i>]
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<b>postconf</b> [<b>-dfhnv</b>] [<b>-c</b> <i>config</i><b>_</b><i>dir</i>] [<b>-C</b> <i>class,...</i>] [<i>parame-</i>
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<b>postconf</b> [<b>-ev</b>] [<b>-c</b> <i>config</i><b>_</b><i>dir</i>] [<i>parameter=value ...</i>]
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<b>postconf</b> [<b>-#v</b>] [<b>-c</b> <i>config</i><b>_</b><i>dir</i>] [<i>parameter ...</i>]
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<b>Managing <a href="master.5.html">master.cf</a>:</b>
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<b>postconf</b> [<b>-fMv</b>] [<b>-c</b> <i>config</i><b>_</b><i>dir</i>] [<i>service ...</i>]
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<b>Managing bounce message templates:</b>
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<b>postconf</b> [<b>-btv</b>] [<b>-c</b> <i>config</i><b>_</b><i>dir</i>] [<i>template</i><b>_</b><i>file</i>]
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<b>Managing other configuration:</b>
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<b>postconf</b> [<b>-aAlmv</b>] [<b>-c</b> <i>config</i><b>_</b><i>dir</i>]
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The <a href="postconf.1.html"><b>postconf</b>(1)</a> command displays the actual values of con-
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figuration parameters, changes configuration parameter
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values, or displays other configuration information about
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the Postfix mail system.
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By default, the <a href="postconf.1.html"><b>postconf</b>(1)</a> command displays the values of
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<a href="postconf.5.html"><b>main.cf</b></a> configuration parameters, and warns about possible
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mis-typed parameter names (Postfix 2.9 and later). It can
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also change <a href="postconf.5.html"><b>main.cf</b></a> configuration parameter values, or
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display other configuration information about the Postfix
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<b>-a</b> List the available SASL server plug-in types. The
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SASL plug-in type is selected with the
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<b>-a</b> List the available SASL server plug-in types. The
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SASL plug-in type is selected with the
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<b><a href="postconf.5.html#smtpd_sasl_type">smtpd_sasl_type</a></b> configuration parameter by specify-
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ing one of the names listed below.
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<b>cyrus</b> This server plug-in is available when Post-
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<b>cyrus</b> This server plug-in is available when Post-
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fix is built with Cyrus SASL support.
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This server plug-in uses the Dovecot authen-
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tication server, and is available when Post-
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fix is built with any form of SASL support.
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fix is built with any form of SASL support.
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This feature is available with Postfix 2.3 and
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<b>-b</b> [<i>template</i><b>_</b><i>file</i>]
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Display the message text that appears at the begin-
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ning of delivery status notification (DSN) mes-
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sages, with $<b>name</b> expressions replaced by actual
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values. To override the built-in message text,
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specify a template file at the end of the command
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line, or specify a template file in <a href="postconf.5.html">main.cf</a> with
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the <b><a href="postconf.5.html#bounce_template_file">bounce_template_file</a></b> parameter. To force
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selection of the built-in message text templates,
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specify an empty template file name (in shell lan-
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This feature is available with Postfix 2.3 and
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sages, replacing $<b>name</b> expressions with actual val-
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ues as described in <a href="bounce.5.html"><b>bounce</b>(5)</a>.
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To override the built-in templates, specify a tem-
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plate file name at the end of the <a href="postconf.1.html"><b>postconf</b>(1)</a> com-
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mand line, or specify a file name in <a href="postconf.5.html"><b>main.cf</b></a> with
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the <b><a href="postconf.5.html#bounce_template_file">bounce_template_file</a></b> parameter.
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To force selection of the built-in templates, spec-
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ify an empty template file name on the <a href="postconf.1.html"><b>postconf</b>(1)</a>
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command line (in shell language: "").
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This feature is available with Postfix 2.3 and
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<b>-c</b> <i>config</i><b>_</b><i>dir</i>
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The <a href="postconf.5.html"><b>main.cf</b></a> configuration file is in the named
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The <a href="postconf.5.html"><b>main.cf</b></a> configuration file is in the named
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directory instead of the default configuration
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<b>-d</b> Print default parameter settings instead of actual
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<b>-e</b> Edit the <a href="postconf.5.html"><b>main.cf</b></a> configuration file. The file is
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copied to a temporary file then renamed into place.
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Parameters and values are specified on the command
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line. Use quotes in order to protect shell
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metacharacters and whitespace.
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With Postfix version 2.8 and later, the <b>-e</b> is no
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<b>-h</b> Show parameter values only, not the "<i>name =</i> " label
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that normally precedes the value.
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<b>-l</b> List the names of all supported mailbox locking
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<b>-C</b> <i>class,...</i>
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When displaying <a href="postconf.5.html"><b>main.cf</b></a> parameters, select only
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parameters from the specified class(es):
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Parameters with built-in names.
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Parameters with service-defined names (the
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first field of a <a href="master.5.html"><b>master.cf</b></a> entry plus a
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Postfix-defined suffix).
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<b>user</b> Parameters with user-defined names.
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<b>all</b> All the above classes.
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The default is as if "<b>-C all</b>" is specified.
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<b>-d</b> Print <a href="postconf.5.html"><b>main.cf</b></a> default parameter settings instead of
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actual settings. Specify <b>-df</b> to fold long lines
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for human readability (Postfix 2.9 and later).
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<b>-e</b> Edit the <a href="postconf.5.html"><b>main.cf</b></a> configuration file, and update
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parameter settings with the "<i>name</i>=<i>value</i>" pairs on
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the <a href="postconf.1.html"><b>postconf</b>(1)</a> command line. The file is copied to
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a temporary file then renamed into place. Specify
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quotes to protect special characters and whitespace
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on the <a href="postconf.1.html"><b>postconf</b>(1)</a> command line.
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The <b>-e</b> is no longer needed with Postfix version 2.8
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<b>-f</b> Fold long lines when printing <a href="postconf.5.html"><b>main.cf</b></a> or <a href="master.5.html"><b>master.cf</b></a>
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configuration file entries, for human readability.
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This feature is available with Postfix 2.9 and
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<b>-h</b> Show <a href="postconf.5.html"><b>main.cf</b></a> parameter values without the "<i>name</i> = "
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label that normally precedes the value.
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<b>-l</b> List the names of all supported mailbox locking
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methods. Postfix supports the following methods:
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<b>flock</b> A kernel-based advisory locking method for
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local files only. This locking method is
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available on systems with a BSD compatible
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<b>flock</b> A kernel-based advisory locking method for
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local files only. This locking method is
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available on systems with a BSD compatible
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<b>fcntl</b> A kernel-based advisory locking method for
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<b>fcntl</b> A kernel-based advisory locking method for
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local and remote files.
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An application-level locking method. An
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application locks a file named <i>filename</i> by
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creating a file named <i>filename</i><b>.lock</b>. The
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application is expected to remove its own
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lock file, as well as stale lock files that
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An application-level locking method. An
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application locks a file named <i>filename</i> by
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creating a file named <i>filename</i><b>.lock</b>. The
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application is expected to remove its own
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lock file, as well as stale lock files that
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were left behind after abnormal termination.
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<b>-m</b> List the names of all supported lookup table types.
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<b>static</b> (read-only)
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A table that always returns its name as
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lookup result. For example, <b>static:foobar</b>
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lookup result. For example, <b><a href="DATABASE_README.html#types">static</a>:foobar</b>
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always returns the string <b>foobar</b> as lookup
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<b>tcp</b> (read-only)
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Perform lookups using a simple request-reply
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protocol that is described in <a href="tcp_table.5.html"><b>tcp_table</b>(5)</a>.
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protocol that is described in <a href="tcp_table.5.html"><b>tcp_table</b>(5)</a>.
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<b>texthash</b> (read-only)
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Produces similar results as hash: files,
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Produces similar results as hash: files,
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except that you don't need to run the
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<a href="postmap.1.html">postmap(1)</a> command before you can use the
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file, and that it does not detect changes
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<a href="postmap.1.html"><b>postmap</b>(1)</a> command before you can use the
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file, and that it does not detect changes
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after the file is read.
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<b>unix</b> (read-only)
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A limited way to query the UNIX authentica-
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A limited way to query the UNIX authentica-
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tion database. The following tables are
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<b>unix:passwd.byname</b>
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The table is the UNIX password data-
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base. The key is a login name. The
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result is a password file entry in
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The table is the UNIX password data-
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base. The key is a login name. The
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result is a password file entry in
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<b>passwd</b>(5) format.
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<b>unix:group.byname</b>
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The table is the UNIX group database.
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The key is a group name. The result
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is a group file entry in <b>group</b>(5)
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The key is a group name. The result
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is a group file entry in <b>group</b>(5)
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Other table types may exist depending on how Post-
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Other table types may exist depending on how Post-
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<b>-n</b> Print parameter settings that are not left at their
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built-in default value, because they are explicitly
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specified in <a href="postconf.5.html">main.cf</a>.
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<b>-M</b> Show <a href="master.5.html"><b>master.cf</b></a> file contents instead of <a href="postconf.5.html"><b>main.cf</b></a>
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file contents. Specify <b>-Mf</b> to fold long lines for
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If <i>service ...</i> is specified, only the matching ser-
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vices will be output. For example, "<b>postconf -Mf</b>
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<b>inet</b>" will output all services that listen on the
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Specify zero or more arguments, each with a <i>ser-</i>
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<i>vice-type</i> name (<b>inet</b>, <b>unix</b>, <b>fifo</b>, or <b>pass</b>) or with
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a <i>service-name.service-type</i> pair, where <i>service-</i>
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<i>name</i> is the first field of a <a href="master.5.html">master.cf</a> entry.
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This feature is available with Postfix 2.9 and
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<b>-n</b> Print <a href="postconf.5.html"><b>main.cf</b></a> parameter settings that are explic-
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itly specified in <a href="postconf.5.html"><b>main.cf</b></a>. Specify <b>-nf</b> to fold
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long lines for human readability (Postfix 2.9 and
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<b>-t</b> [<i>template</i><b>_</b><i>file</i>]
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Display the templates for delivery status notifica-
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tion (DSN) messages. To override the built-in tem-
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plates, specify a template file at the end of the
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command line, or specify a template file in <a href="postconf.5.html">main.cf</a>
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with the <b><a href="postconf.5.html#bounce_template_file">bounce_template_file</a></b> parameter. To force
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selection of the built-in templates, specify an
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empty template file name (in shell language: "").
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Display the templates for text that appears at the
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beginning of delivery status notification (DSN)
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messages, without expanding $<b>name</b> expressions.
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To override the built-in templates, specify a tem-
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plate file name at the end of the <a href="postconf.1.html"><b>postconf</b>(1)</a> com-
301
mand line, or specify a file name in <a href="postconf.5.html"><b>main.cf</b></a> with
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the <b><a href="postconf.5.html#bounce_template_file">bounce_template_file</a></b> parameter.
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To force selection of the built-in templates, spec-
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ify an empty template file name on the <a href="postconf.1.html"><b>postconf</b>(1)</a>
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command line (in shell language: "").
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This feature is available with Postfix 2.3 and
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tiple <b>-v</b> options make the software increasingly
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<b>-#</b> Edit the <a href="postconf.5.html"><b>main.cf</b></a> configuration file. The file is
243
copied to a temporary file then renamed into place.
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The parameters specified on the command line are
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commented-out, so that they revert to their default
246
values. Specify a list of parameter names, not
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name=value pairs. There is no <b>postconf</b> command to
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perform the reverse operation.
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<b>-#</b> Edit the <a href="postconf.5.html"><b>main.cf</b></a> configuration file, and comment
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out the parameters given on the <a href="postconf.1.html"><b>postconf</b>(1)</a> command
317
line, so that those parameters revert to their
318
default values. The file is copied to a temporary
319
file then renamed into place. Specify a list of
320
parameter names, not <i>name</i>=<i>value</i> pairs. There is no
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<a href="postconf.1.html"><b>postconf</b>(1)</a> command to perform the reverse opera-
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This feature is available with Postfix 2.6 and
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This feature is available with Postfix 2.6 and
253
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<b>DIAGNOSTICS</b>
added
removed
html/postconf.1.html
