    POSTCONF(1)                                                        POSTCONF(1)

    NAME
           postconf - Postfix configuration utility

    SYNOPSIS
           postconf [-dhnv] [-c config_dir] [parameter ...]

           postconf [-aAmlv] [-c config_dir]

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

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

           postconf [-btv] [-c config_dir] [template_file]

    DESCRIPTION
           The postconf(1) command displays the actual values of con-
           figuration  parameters,  changes  configuration  parameter
           values,  or displays 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 specify-
                  ing one of the names listed below.

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

                  dovecot
                         This server plug-in uses the Dovecot authen-
                         tication server, and is available when Post-
                         fix 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  Post-
                         fix 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 begin-
                  ning  of  delivery  status  notification (DSN) mes-
                  sages, with $name expressions  replaced  by  actual
                  values.   To  override  the  built-in message text,
                  specify a template file at the end of  the  command
                  line,  or  specify  a template file in main.cf with
                  the  bounce_template_file  parameter.    To   force
                  selection  of  the built-in message text templates,
                  specify an empty template file name (in shell  lan-
                  guage: "").

                  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.

           -d     Print default parameter settings instead of  actual
                  settings.

           -e     Edit  the  main.cf  configuration file. The file is
                  copied to a temporary file then renamed into place.
                  Parameters  and values are specified on the command
                  line.  Use  quotes  in  order  to   protect   shell
                  metacharacters and whitespace.

           -h     Show  parameter  values  only,  not 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 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 DATA-
                  BASE_README document.

                  btree  A sorted, balanced tree structure.  This  is
                         available on systems with support for Berke-
                         ley DB databases.

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

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

                  dbm    An indexed file type based on hashing.  This
                         is 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.

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

                  ldap (read-only)
                         Perform  lookups  using  the  LDAP protocol.
                         This is described in ldap_table(5).

                  mysql (read-only)
                         Perform lookups using  the  MYSQL  protocol.
                         This is described in mysql_table(5).

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

                  pgsql (read-only)
                         Perform  lookups using the PostgreSQL proto-
                         col. This is described in pgsql_table(5).

                  proxy (read-only)
                         A lookup table that is implemented  via  the
                         Postfix  proxymap(8) service. The table name
                         syntax is type:name.

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

                  sdbm   An indexed file type based on hashing.  This
                         is  available  on  systems  with support for
                         SDBM databases.

                  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)
                         Perform lookups using a simple request-reply
                         protocol that is described in  tcp_table(5).
                         This feature is not included with the stable
                         Postfix release.

                  unix (read-only)
                         A limited way to query the UNIX  authentica-
                         tion  database.  The  following  tables  are
                         implemented:

                         unix:passwd.byname
                                The table is the UNIX password  data-
                                base.  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  Post-
                  fix was built.

           -n     Print parameter settings that are not left at their
                  built-in default value, because they are explicitly
                  specified in main.cf.

           -t [template_file]
                  Display the templates for delivery status notifica-
                  tion (DSN) messages. To override the built-in  tem-
                  plates,  specify  a template file at the end of the
                  command line, or specify a template file in main.cf
                  with  the bounce_template_file parameter.  To force
                  selection of the  built-in  templates,  specify  an
                  empty template file name (in shell language: "").

                  This  feature  is  available  with  Postfix 2.3 and
                  later.

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

           -#     Edit the main.cf configuration file.  The  file  is
                  copied to a temporary file then renamed into place.
                  The parameters specified on the  command  line  are
                  commented-out, so that they revert to their default
                  values. Specify a  list  of  parameter  names,  not
                  name=value  pairs.  There is no postconf command to
                  perform the reverse operation.

                  This feature is  available  with  Postfix  2.6  and
                  later.

    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  mes-
                  sage templates.

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

    SEE ALSO
           bounce(5), bounce template file format
           postconf(5), configuration parameters

    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

                                                                       POSTCONF(1)