    POSTCONF(1)                                                        POSTCONF(1)

    NAME
           postconf - Postfix configuration utility

    SYNOPSIS
           Managing main.cf:

           postconf [-dfhnv] [-c config_dir] [-C class,...] [parame-
           ter ...]

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

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

           Managing master.cf:

           postconf [-fMv] [-c config_dir] [service ...]

           Managing bounce message templates:

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

           Managing other configuration:

           postconf [-aAlmv] [-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 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, replacing $name expressions with actual val-
                  ues as described in bounce(5).

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

                  To force selection of the built-in templates, spec-
                  ify 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.

           -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. 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 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.

           -h     Show main.cf parameter 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 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.

                  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.  This
                         is available on  systems  with  support  for
                         Berkeley DB databases.

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

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

                  memcache
                         Perform lookups using the memcache protocol.
                         This is described in memcache_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  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.

                  sqlite (read-only)
                         Perform lookups from SQLite database  files.
                         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)
                         Perform lookups using a simple request-reply
                         protocol  that 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 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.

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

                  If service ... is specified, only the matching ser-
                  vices will be output. For  example,  "postconf  -Mf
                  inet"  will  output all services that listen on the
                  network.

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

                  This  feature  is  available  with  Postfix 2.9 and
                  later.

           -n     Print main.cf parameter settings that  are  explic-
                  itly  specified  in  main.cf.   Specify -nf to fold
                  long lines for human readability (Postfix  2.9  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 built-in templates, specify a tem-
                  plate file name at the end of the postconf(1)  com-
                  mand  line,  or specify a file name in main.cf with
                  the bounce_template_file parameter.

                  To force selection of the built-in templates, spec-
                  ify  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. Mul-
                  tiple -v options  make  the  software  increasingly
                  verbose.

           -#     Edit  the  main.cf  configuration file, and comment
                  out the parameters given on the postconf(1) command
                  line,  so  that  those  parameters  revert to their
                  default values.  The file is copied to a  temporary
                  file  then  renamed  into place.  Specify a list of
                  parameter names, not name=value pairs.  There is no
                  postconf(1)  command  to perform the reverse opera-
                  tion.

                  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
           /etc/postfix/master.cf, Postfix master daemon configuraton

    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

                                                                       POSTCONF(1)