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POSTCONF(1)                 General Commands Manual                POSTCONF(1)




NAME
       postconf - Postfix configuration utility

SYNOPSIS
       Managing main.cf:

       postconf [-dfhnopvx] [-c config_dir] [-C class,...] [parameter ...]

       postconf [-epv] [-c config_dir] parameter=value ...

       postconf -# [-pv] [-c config_dir] parameter ...

       postconf -X [-pv] [-c config_dir] parameter ...

       Managing master.cf service entries:

       postconf -M [-fovx] [-c config_dir] [service[/type] ...]

       postconf -M [-ev] [-c config_dir] service/type=value ...

       postconf -M# [-v] [-c config_dir] service/type ...

       postconf -MX [-v] [-c config_dir] service/type ...

       Managing master.cf service fields:

       postconf -F [-fovx] [-c config_dir] [service[/type[/field]] ...]

       postconf -F [-ev] [-c config_dir] service/type/field=value ...

       Managing master.cf service parameters:

       postconf -P [-fovx] [-c config_dir] [service[/type[/parameter]] ...]

       postconf -P [-ev] [-c config_dir] service/type/parameter=value ...

       postconf -PX [-v] [-c config_dir] service/type/parameter ...

       Managing bounce message templates:

       postconf -b [-v] [-c config_dir] [template_file]

       postconf -t [-v] [-c config_dir] [template_file]

       Managing other configuration:

       postconf -a|-A|-l|-m [-v] [-c config_dir]

DESCRIPTION
       By default, the postconf(1) command displays the values of main.cf
       configuration parameters, and warns about possible mis-typed parameter
       names (Postfix 2.9 and later).  It can also change main.cf
       configuration parameter values, or display other configuration
       information about the Postfix mail system.

       Options:

       -a     List the available SASL server plug-in types.  The SASL plug-in
              type is selected with the smtpd_sasl_type configuration
              parameter by specifying one of the names listed below.

              cyrus  This server plug-in is available when Postfix is built
                     with Cyrus SASL support.

              dovecot
                     This server plug-in uses the Dovecot authentication
                     server, and is available when Postfix is built with any
                     form of SASL support.

              This feature is available with Postfix 2.3 and later.

       -A     List the available SASL client plug-in types.  The SASL plug-in
              type is selected with the smtp_sasl_type or lmtp_sasl_type
              configuration parameters by specifying one of the names listed
              below.

              cyrus  This client plug-in is available when Postfix is built
                     with Cyrus SASL support.

              This feature is available with Postfix 2.3 and later.

       -b [template_file]
              Display the message text that appears at the beginning of
              delivery status notification (DSN) messages, replacing $name
              expressions with actual values as described in bounce(5).

              To override the built-in templates, specify a template file name
              at the end of the postconf(1) command line, or specify a file
              name in main.cf with the bounce_template_file parameter.

              To force selection of the built-in templates, specify an empty
              template file name on the postconf(1) command line (in shell
              language: "").

              This feature is available with Postfix 2.3 and later.

       -c config_dir
              The main.cf configuration file is in the named directory instead
              of the default configuration directory.

       -C class,...
              When displaying main.cf parameters, select only parameters from
              the specified class(es):

              builtin
                     Parameters with built-in names.

              service
                     Parameters with service-defined names (the first field of
                     a master.cf entry plus a Postfix-defined suffix).

              user   Parameters with user-defined names.

              all    All the above classes.

              The default is as if "-C all" is specified.

              This feature is available with Postfix 2.9 and later.

       -d     Print main.cf default parameter settings instead of actual
              settings.  Specify -df to fold long lines for human readability
              (Postfix 2.9 and later).

       -e     Edit the main.cf configuration file, and update parameter
              settings with the "name=value" pairs on the postconf(1) command
              line.

              With -M, edit the master.cf configuration file, and replace one
              or more service entries with new values as specified with
              "service/type=value" on the postconf(1) command line.

              With -F, edit the master.cf configuration file, and replace one
              or more service fields with new values as specied with
              "service/type/field=value" on the postconf(1) command line.
              Currently, the "command" field contains the command name and
              command arguments.  this may change in the near future, so that
              the "command" field contains only the command name, and a new
              "arguments" pseudofield contains the command arguments.

              With -P, edit the master.cf configuration file, and add or
              update one or more service parameter settings (-o
              parameter=value settings) with new values as specied with
              "service/type/parameter=value" on the postconf(1) command line.

              In all cases the file is copied to a temporary file then renamed
              into place.  Specify quotes to protect special characters and
              whitespace on the postconf(1) command line.

              The -e option is no longer needed with Postfix version 2.8 and
              later.

       -f     Fold long lines when printing main.cf or master.cf configuration
              file entries, for human readability.

              This feature is available with Postfix 2.9 and later.

       -F     Show master.cf per-entry field settings (by default all services
              and all fields), formatted as one "service/type/field=value" per
              line. Specify -Ff to fold long lines.

              Specify one or more "service/type/field" instances on the
              postconf(1) command line to limit the output to fields of
              interest.  Trailing parameter name or service type fields that
              are omitted will be handled as "*" wildcard fields.

              This feature is available with Postfix 2.11 and later.

       -h     Show parameter or attribute values without the "name = " label
              that normally precedes the value.

       -l     List the names of all supported mailbox locking methods.
              Postfix supports the following methods:

              flock  A kernel-based advisory locking method for local files
                     only.  This locking method is available on systems with a
                     BSD compatible library.

              fcntl  A kernel-based advisory locking method for local and
                     remote files.

              dotlock
                     An application-level locking method. An application locks
                     a file named filename by creating a file named
                     filename.lock.  The application is expected to remove its
                     own lock file, as well as stale lock files that were left
                     behind after abnormal program termination.

       -m     List the names of all supported lookup table types. In Postfix
              configuration files, lookup tables are specified as type:name,
              where type is one of the types listed below. The table name
              syntax depends on the lookup table type as described in the
              DATABASE_README document.

              btree  A sorted, balanced tree structure.  Available on systems
                     with support for Berkeley DB databases.

              cdb    A read-optimized structure with no support for
                     incremental updates.  Available on systems with support
                     for CDB databases.

              cidr   A table that associates values with Classless Inter-
                     Domain Routing (CIDR) patterns. This is described in
                     cidr_table(5).

              dbm    An indexed file type based on hashing.  Available on
                     systems with support for DBM databases.

              environ
                     The UNIX process environment array. The lookup key is the
                     variable name. Originally implemented for testing,
                     someone may find this useful someday.

              fail   A table that reliably fails all requests. The lookup
                     table name is used for logging. This table exists to
                     simplify Postfix error tests.

              hash   An indexed file type based on hashing.  Available on
                     systems with support for Berkeley DB databases.

              internal
                     A non-shared, in-memory hash table. Its content are lost
                     when a process terminates.

              lmdb   OpenLDAP LMDB database (a memory-mapped, persistent
                     file).  Available on systems with support for LMDB
                     databases.  This is described in lmdb_table(5).

              ldap (read-only)
                     LDAP database client. This is described in ldap_table(5).

              memcache
                     Memcache database client. This is described in
                     memcache_table(5).

              mysql (read-only)
                     MySQL database client.  Available on systems with support
                     for MySQL databases.  This is described in
                     mysql_table(5).

              pcre (read-only)
                     A lookup table based on Perl Compatible Regular
                     Expressions.  The file format is described in
                     pcre_table(5).

              pgsql (read-only)
                     PostgreSQL database client. This is described in
                     pgsql_table(5).

              proxy  Postfix proxymap(8) client for shared access to Postfix
                     databases. The table name syntax is type:name.

              regexp (read-only)
                     A lookup table based on regular expressions. The file
                     format is described in regexp_table(5).

              sdbm   An indexed file type based on hashing.  Available on
                     systems with support for SDBM databases.

              socketmap (read-only)
                     Sendmail-style socketmap client. The table name is
                     inet:host:port:name for a TCP/IP server, or
                     unix:pathname:name for a UNIX-domain server. This is
                     described in socketmap_table(5).

              sqlite (read-only)
                     SQLite database. This is described in sqlite_table(5).

              static (read-only)
                     A table that always returns its name as lookup result.
                     For example, static:foobar always returns the string
                     foobar as lookup result.

              tcp (read-only)
                     TCP/IP client. The protocol is described in tcp_table(5).

              texthash (read-only)
                     Produces similar results as hash: files, except that you
                     don't need to run the postmap(1) command before you can
                     use the file, and that it does not detect changes after
                     the file is read.

              unix (read-only)
                     A limited view of the UNIX authentication database. The
                     following tables are implemented:

                     unix:passwd.byname
                            The table is the UNIX password database. The key
                            is a login name.  The result is a password file
                            entry in passwd(5) format.

                     unix:group.byname
                            The table is the UNIX group database. The key is a
                            group name.  The result is a group file entry in
                            group(5) format.

              Other table types may exist depending on how Postfix was built.

       -M     Show master.cf file contents instead of main.cf file contents.
              Specify -Mf to fold long lines for human readability.

              Specify zero or more arguments, each with a service-name or
              service-name/service-type pair, where service-name is the first
              field of a master.cf entry and service-type is one of (inet,
              unix, fifo, or pass).

              If service-name or service-name/service-type is specified, only
              the matching master.cf entries will be output. For example,
              "postconf -Mf smtp" will output all services named "smtp", and
              "postconf -Mf smtp/inet" will output only the smtp service that
              listens on the network.  Trailing service type fields that are
              omitted will be handled as "*" wildcard fields.

              This feature is available with Postfix 2.9 and later. The syntax
              was changed from "name.type" to "name/type", and "*" wildcard
              support was added with Postfix 2.11.

       -n     Show only configuration parameters that have explicit name=value
              settings in main.cf.  Specify -nf to fold long lines for human
              readability (Postfix 2.9 and later).

       -o name=value
              Override main.cf parameter settings.

              This feature is available with Postfix 2.10 and later.

       -p     Show main.cf parameter settings. This is the default.

              This feature is available with Postfix 2.11 and later.

       -P     Show master.cf service parameter settings (by default all
              services and all parameters).  formatted as one
              "service/type/parameter=value" per line.  Specify -Pf to fold
              long lines.

              Specify one or more "service/type/parameter" instances on the
              postconf(1) command line to limit the output to parameters of
              interest.  Trailing parameter name or service type fields that
              are omitted will be handled as "*" wildcard fields.

              This feature is available with Postfix 2.11 and later.

       -t [template_file]
              Display the templates for text that appears at the beginning of
              delivery status notification (DSN) messages, without expanding
              $name expressions.

              To override the built-in templates, specify a template file name
              at the end of the postconf(1) command line, or specify a file
              name in main.cf with the bounce_template_file parameter.

              To force selection of the built-in templates, specify an empty
              template file name on the postconf(1) command line (in shell
              language: "").

              This feature is available with Postfix 2.3 and later.

       -v     Enable verbose logging for debugging purposes. Multiple -v
              options make the software increasingly verbose.

       -x     Expand $name in main.cf or master.cf parameter values. The
              expansion is recursive.

              This feature is available with Postfix 2.10 and later.

       -X     Edit the main.cf configuration file, and remove the parameters
              named on the postconf(1) command line.  Specify a list of
              parameter names, not "name=value" pairs.

              With -M, edit the master.cf configuration file, and remove one
              or more service entries as specified with "service/type" on the
              postconf(1) command line.

              With -P, edit the master.cf configuration file, and remove one
              or more service parameter settings (-o parameter=value settings)
              as specied with "service/type/parameter" on the postconf(1)
              command line.

              In all cases the file is copied to a temporary file then renamed
              into place.  Specify quotes to protect special characters on the
              postconf(1) command line.

              There is no postconf(1) command to perform the reverse
              operation.

              This feature is available with Postfix 2.10 and later.  Support
              for -M and -P was added with Postfix 2.11.

       -#     Edit the main.cf configuration file, and comment out the
              parameters named on the postconf(1) command line, so that those
              parameters revert to their default values.  Specify a list of
              parameter names, not "name=value" pairs.

              With -M, edit the master.cf configuration file, and comment out
              one or more service entries as specified with "service/type" on
              the postconf(1) command line.

              In all cases the file is copied to a temporary file then renamed
              into place.  Specify quotes to protect special characters on the
              postconf(1) command line.

              There is no postconf(1) command to perform the reverse
              operation.

              This feature is available with Postfix 2.6 and later. Support
              for -M was added with Postfix 2.11.

DIAGNOSTICS
       Problems are reported to the standard error stream.

ENVIRONMENT

       MAIL_CONFIG
              Directory with Postfix configuration files.

CONFIGURATION PARAMETERS
       The following main.cf parameters are especially relevant to this
       program.

       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.

       bounce_template_file (empty)
              Pathname of a configuration file with bounce message templates.

FILES
       /etc/postfix/main.cf, Postfix configuration parameters
       /etc/postfix/master.cf, Postfix master daemon configuration

SEE ALSO
       bounce(5), bounce template file format master(5), master.cf
       configuration file syntax postconf(5), main.cf configuration
       file syntax

README FILES
       Use "postconf readme_directory" or "postconf html_directory" to locate
       this information.
       DATABASE_README, Postfix lookup table overview

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



                                                                   POSTCONF(1)