POSTCONF(1)                                                        POSTCONF(1)

NAME
       postconf - Postfix configuration utility

SYNOPSIS
   Managing main.cf:

       postconf [-dfhHnopqvx] [-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 [-foqvx] [-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 [-fhHoqvx] [-c config_dir] [service[/type[/field]] ...]

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

   Managing master.cf service parameters:

       postconf -P [-fhHoqvx] [-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, as it is assumed whenever a value is specified (empty  or
              non-empty).

       -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;
                     with a key-value pair inside "{}", whitespace is  ignored
                     after  the  opening  "{",  around the "=" between key and
                     value, and before the closing "}". Inline  tables  elimi-
                     nate  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.

              mongodb
                     MongoDB database client. This is described in mongodb_ta-
                     ble(5).

                     This feature is available with Postfix 3.9 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 the opening "{" and  before  the
                     closing "}". 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:
                  LANG=C 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  lets  you  see  the
              effect  changing a parameter would have when it is used in other
              configuration parameters, e.g.:
                  postconf -x -o stress=yes

              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.

       -q     Do not log warnings for deprecated or unused parameters.

              This feature is available with Postfix 3.9 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)