POSTCONF(1)                                                        POSTCONF(1)

NAME
       postconf - Postfix configuration utility

SYNOPSIS
   Managing main.cf:

       postconf [-dfhHnopvx] [-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 [-fhHovx] [-c config_dir] [service[/type[/field]] ...]

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

   Managing master.cf service parameters:

       postconf -P [-fhHovx] [-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 TLS features:

       postconf -T mode [-v] [-c config_dir]

   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 con-
       figuration  parameters,  and  warns  about possible mis-typed parameter
       names (Postfix 2.9 and later).  The command  can  also  change  main.cf
       configuration parameter values, or display other configuration informa-
       tion about the Postfix mail system.

       Options:

       -a     List the available SASL  plug-in  types  for  the  Postfix  SMTP
              server.  The  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  plug-in  types  for  the  Postfix  SMTP
              client.  The 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 deliv-
              ery  status notification (DSN) messages, expanding $name expres-
              sions with actual values as described in bounce(5).

              To override the bounce_template_file parameter setting,  specify
              a  template  file  name  at the end of the "postconf -b" command
              line. Specify an empty file name to display  built-in  templates
              (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  set-
              tings.   Specify  -df  to  fold long lines for human readability
              (Postfix 2.9 and later).

       -e     Edit the main.cf configuration file, and update  parameter  set-
              tings  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 "ser-
              vice/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 specified with "ser-
              vice/type/field=value" on the  postconf(1)  command  line.  Cur-
              rently,  the  "command" field contains the command name and com-
              mand arguments.  this may change in the near future, so that the
              "command" field contains only the command name, and a new "argu-
              ments" pseudofield contains the command arguments.

              With -P, edit the  master.cf  configuration  file,  and  add  or
              update  one  or  more  service  parameter  settings  (-o parame-
              ter=value settings) with new  values  as  specified  with  "ser-
              vice/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  "service/type/field=value",  one
              per line. Specify -Ff to fold long lines.

              Specify  one or more "service/type/field" instances on the post-
              conf(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.

       -H     Show  parameter  or  attribute names without the " = value" that
              normally follows the name.

              This feature is available with Postfix 3.1 and later.

       -l     List the names of all supported mailbox locking methods.   Post-
              fix 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 file-
                     name.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 syn-
              tax  depends  on the lookup table type as described in the DATA-
              BASE_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 incremen-
                     tal updates.  Available on systems with support  for  CDB
                     databases.

                     This feature is available with Postfix 2.2 and later.

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

                     This feature is available with Postfix 2.2 and later.

              dbm    An indexed file type based on hashing.  Available on sys-
                     tems with support for DBM databases.

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

              fail   A  table that reliably fails all requests. The lookup ta-
                     ble name is used for logging. This table exists  to  sim-
                     plify Postfix error tests.

                     This feature is available with Postfix 2.9 and later.

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

              inline (read-only)
                     A non-shared, in-memory lookup table. Example:  "inline:{
                     key=value,  {  key  =  text with whitespace or comma }}".
                     Key-value pairs are separated  by  whitespace  or  comma;
                     whitespace  after  "{"  and before "}" is ignored. Inline
                     tables eliminate the need to create a database  file  for
                     just  a  few  fixed  elements.   See also the static: map
                     type.

                     This feature is available with Postfix 3.0 and later.

              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  data-
                     bases.  This is described in lmdb_table(5).

                     This feature is available with Postfix 2.11 and later.

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

              memcache
                     Memcache database  client.  This  is  described  in  mem-
                     cache_table(5).

                     This feature is available with Postfix 2.9 and later.

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

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

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

                     This feature is available with Postfix 2.1 and later.

              pipemap (read-only)
                     A  lookup  table  that  constructs  a pipeline of tables.
                     Example: "pipemap:{type_1:name_1,  ...,  type_n:name_n}".
                     Each  "pipemap:" query is given to the first table.  Each
                     lookup result becomes the query for the next table in the
                     pipeline,  and  the last table produces the final result.
                     When any table lookup produces no  result,  the  pipeline
                     produces  no result. The first and last characters of the
                     "pipemap:" table name must be "{" and "}".  Within these,
                     individual maps are separated with comma or whitespace.

                     This feature is available with Postfix 3.0 and later.

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

                     This feature is available with Postfix 2.0 and later.

              randmap (read-only)
                     An in-memory table that performs random selection.  Exam-
                     ple:  "randmap:{result_1,  ...,  result_n}".  Each  table
                     query returns a random choice from the specified results.
                     The  first  and  last  characters of the "randmap:" table
                     name must be  "{"  and  "}".   Within  these,  individual
                     results are separated with comma or whitespace. To give a
                     specific result more weight, specify it multiple times.

                     This feature is available with Postfix 3.0 and later.

              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 sys-
                     tems with support for SDBM databases.

                     This feature is available with Postfix 2.2 and later.

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

                     This feature is available with Postfix 2.10 and later.

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

                     This feature is available with Postfix 2.8 and later.

              static (read-only)
                     A  table  that  always returns its name as lookup result.
                     For example, static:foobar always returns the string foo-
                     bar  as lookup result. Specify "static:{ text with white-
                     space }" when the result contains whitespace;  this  form
                     ignores whitespace after "{" and before "}". See also the
                     inline: map.

                     The form "static:{text} is available with Postfix 3.0 and
                     later.

              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.

                     This feature is available with Postfix 2.8 and later.

              unionmap (read-only)
                     A  table  that sends each query to multiple lookup tables
                     and that concatenates all  found  results,  separated  by
                     comma.  The table name syntax is the same as for pipemap.

                     This feature is available with Postfix 3.0 and later.

              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 ser-
              vice-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). To show settings that dif-
              fer from built-in defaults only, use the following bash syntax:
                  comm -23 <(postconf -n) <(postconf -d)
              Replace  "-23"  with  "-12"  to  show  settings  that  duplicate
              built-in defaults.

       -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 ser-
              vices and all parameters),  formatted  as  "service/type/parame-
              ter=value", one 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 bounce_template_file parameter setting,  specify
              a  template  file  name  at the end of the "postconf -t" command
              line. Specify an empty file name to display  built-in  templates
              (in shell language: "").

              This feature is available with Postfix 2.3 and later.

       -T mode
              If  Postfix  is compiled without TLS support, the -T option pro-
              duces no output.  Otherwise, if an invalid  mode  is  specified,
              the  -T option reports an error and exits with a non-zero status
              code. The valid modes are:

              compile-version
                     Output the OpenSSL version that Postfix was compiled with
                     (i.e.  the  OpenSSL version in a header file). The output
                     format is the same as with the command "openssl version".

              run-version
                     Output the OpenSSL version that Postfix is linked with at
                     runtime (i.e. the OpenSSL version in a shared library).

              public-key-algorithms
                     Output the lower-case names of the  supported  public-key
                     algorithms, one per-line.

              This feature is available with Postfix 3.1 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 param-
              eter 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  specified  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  opera-
              tion.

              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 parame-
              ters named on the postconf(1) command line, so that those param-
              eters revert to their default values.  Specify a list of parame-
              ter 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 opera-
              tion.

              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 pro-
       gram.

       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.

       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
       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

       Wietse Venema
       Google, Inc.
       111 8th Avenue
       New York, NY 10011, USA

                                                                   POSTCONF(1)