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POSTCONF(1)                 General Commands Manual                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;
                     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.
              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:
                  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
       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
       Wietse Venema
       Google, Inc.
       111 8th Avenue
       New York, NY 10011, USA

                                                                   POSTCONF(1)