Provided by: postfix_3.8.6-1build2_amd64 bug

NAME

       master - Postfix master process configuration file format

DESCRIPTION

       The  Postfix  mail  system is implemented by small number of (mostly) client commands that
       are invoked by users, and by a larger number of services that run in the background.

       Postfix services are implemented by daemon processes. These run in the background, started
       on-demand by the master(8) process.  The master.cf configuration file defines how a client
       program connects to a service, and what daemon program runs when a service  is  requested.
       Most  daemon  processes  are  short-lived  and terminate voluntarily after serving max_use
       clients, or after inactivity for max_idle or more units of time.

       All daemons specified here must speak a Postfix-internal protocol.  In  order  to  execute
       non-Postfix  software  use  the  local(8),  pipe(8)  or  spawn(8) services, or execute the
       software with inetd(8) or equivalent.

       After changing master.cf you must execute "postfix reload" to reload the configuration.

SYNTAX

       The general format of the master.cf file is as follows:

       •      Empty lines and whitespace-only  lines  are  ignored,  as  are  lines  whose  first
              non-whitespace character is a `#'.

       •      A  logical line starts with non-whitespace text. A line that starts with whitespace
              continues a logical line.

       •      Each logical line defines a single Postfix service.  Each service is identified  by
              its name and type as described below.  When multiple lines specify the same service
              name and type, only the last one is remembered.  Otherwise, the order of  master.cf
              service definitions does not matter.

       Each  logical  line consists of eight fields separated by whitespace.  These are described
       below in the order as they appear in the master.cf file.

       Where applicable a field of "-" requests that the built-in  default  value  be  used.  For
       boolean fields specify "y" or "n" to override the default value.

       Service name
              The service name syntax depends on the service type as described next.

       Service type
              Specify one of the following service types:

              inet   The service listens on a TCP/IP socket and is accessible via the network.

                     The  service  name  is specified as host:port, denoting the host and port on
                     which new connections should be accepted. The host part (and colon)  may  be
                     omitted.  Either host or port may be given in symbolic form (see hosts(5) or
                     services(5))  or  in  numeric  form  (IP  address  or  port  number).   Host
                     information  may  be  enclosed inside "[]"; this form is necessary only with
                     IPv6 addresses.

                     Examples: a service named 127.0.0.1:smtp or ::1:smtp receives mail  via  the
                     loopback  interface  only;  and a service named 10025 accepts connections on
                     TCP port 10025  via  all  interfaces  configured  with  the  inet_interfaces
                     parameter.

                     Note:  with  Postfix  version  2.2  and  later  specify  "inet_interfaces  =
                     loopback-only" in  main.cf,  instead  of  hard-coding  loopback  IP  address
                     information in master.cf or in main.cf.

              unix   The  service  listens  on  a UNIX-domain stream socket and is accessible for
                     local clients only.

                     The service name is a pathname  relative  to  the  Postfix  queue  directory
                     (pathname  controlled  with  the  queue_directory configuration parameter in
                     main.cf).

                     On Solaris 8 and earlier systems the unix type is implemented  with  streams
                     sockets.

              unix-dgram
                     The  service  listens on a UNIX-domain datagram socket and is accessible for
                     local clients only.

                     The service name is a pathname  relative  to  the  Postfix  queue  directory
                     (pathname  controlled  with  the  queue_directory configuration parameter in
                     main.cf).

              fifo (obsolete)
                     The service listens on a FIFO (named  pipe)  and  is  accessible  for  local
                     clients only.

                     The  service  name  is  a  pathname  relative to the Postfix queue directory
                     (pathname controlled with the  queue_directory  configuration  parameter  in
                     main.cf).

              pass   The  service  listens  on  a UNIX-domain stream socket, and is accessible to
                     local clients  only.  It  receives  one  open  connection  (file  descriptor
                     passing) per connection request.

                     The  service  name  is  a  pathname  relative to the Postfix queue directory
                     (pathname controlled with the  queue_directory  configuration  parameter  in
                     main.cf).

                     On  Solaris  8 and earlier systems the pass type is implemented with streams
                     sockets.

                     This feature is available as of Postfix version 2.5.

       Private (default: y)
              Whether a service is internal  to  Postfix  (pathname  starts  with  private/),  or
              exposed   through  Postfix  command-line  tools  (pathname  starts  with  public/).
              Internet (type inet) services can't be private.

       Unprivileged (default: y)
              Whether the service runs with root privileges or as the owner of the Postfix system
              (the  owner  name  is  controlled  by  the mail_owner configuration variable in the
              main.cf file).

              The local(8), pipe(8), spawn(8), and virtual(8) daemons require privileges.

       Chroot (default: Postfix >= 3.0: n, Postfix < 3.0: y)
              Whether or not the service runs chrooted to the mail queue directory  (pathname  is
              controlled by the queue_directory configuration variable in the main.cf file).

              Chroot  should  not  be  used  with the local(8), pipe(8), spawn(8), and virtual(8)
              daemons.  Although the proxymap(8) server can run chrooted, doing so  defeats  most
              of the purpose of having that service in the first place.

              The  files in the examples/chroot-setup subdirectory of the Postfix source show how
              to set up  a  Postfix  chroot  environment  on  a  variety  of  systems.  See  also
              BASIC_CONFIGURATION_README for issues related to running daemons chrooted.

       Wake up time (default: 0)
              Automatically  wake up the named service after the specified number of seconds. The
              wake up is implemented by connecting to the service and sending a wake up  request.
              A  ?  at  the end of the wake-up time field requests that no wake up events be sent
              before the first time a service is used.  Specify 0 for no automatic wake up.

              The pickup(8), qmgr(8) and flush(8) daemons require a wake up timer.

       Process limit (default: $default_process_limit)
              The maximum number of processes  that  may  execute  this  service  simultaneously.
              Specify 0 for no process count limit.

              NOTE:  Some  Postfix  services  must be configured as a single-process service (for
              example, qmgr(8)) and some services must be configured with no process  limit  (for
              example, cleanup(8)).  These limits must not be changed.

       Command name + arguments
              The  command  to be executed.  Characters that are special to the shell such as ">"
              or "|" have no special meaning here, and quotes cannot be used to protect arguments
              containing whitespace. To protect whitespace, use "{" and "}" as described below.

              The  command  name  is  relative  to  the  Postfix  daemon  directory  (pathname is
              controlled by the daemon_directory configuration variable).

              The command argument syntax for specific commands is specified  in  the  respective
              daemon manual page.

              The following command-line options have the same effect for all daemon programs:

              -D     Run   the   daemon   under   control  by  the  command  specified  with  the
                     debugger_command  variable  in  the   main.cf   configuration   file.    See
                     DEBUG_README for hints and tips.

              -o { name = value } (long form, Postfix >= 3.0)

              -o name=value (short form)
                     Override  the named main.cf configuration parameter. The parameter value can
                     refer to other  parameters  as  $name  etc.,  just  like  in  main.cf.   See
                     postconf(5) for syntax.

                     NOTE  1: With the "long form" shown above, whitespace after "{", around "=",
                     and before "}" is ignored, and whitespace  within  the  parameter  value  is
                     preserved.

                     NOTE  2: with the "short form" shown above, do not specify whitespace around
                     the "=" or in parameter values. To specify a parameter value  that  contains
                     whitespace,  use  the  long  form  described above, or use commas instead of
                     spaces, or specify the value in main.cf. Example:

                     /etc/postfix/master.cf:
                         submission inet .... smtpd
                             -o smtpd_xxx_yyy=$submission_xxx_yyy

                     /etc/postfix/main.cf
                         submission_xxx_yyy = text with whitespace...

                     NOTE  3:  Over-zealous  use  of  parameter  overrides  makes   the   Postfix
                     configuration hard to understand and maintain.  At a certain point, it might
                     be easier to configure multiple instances of Postfix, instead of configuring
                     multiple personalities via master.cf.

              -v     Increase  the  verbose  logging level. Specify multiple -v options to make a
                     Postfix daemon process increasingly verbose.

              Other command-line arguments
                     Specify "{"  and  "}"  around  command  arguments  that  contain  whitespace
                     (Postfix 3.0 and later). Whitespace after "{" and before "}" is ignored.

SEE ALSO

       master(8), process manager
       postconf(5), configuration parameters

README FILES

       Use "postconf readme_directory" or "postconf html_directory" to locate this information.
       BASIC_CONFIGURATION_README, basic configuration
       DEBUG_README, Postfix debugging

LICENSE

       The Secure Mailer license must be distributed with this software.

AUTHOR(S)

       Initial version by
       Magnus Baeck
       Lund Institute of Technology
       Sweden

       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

                                                                                        MASTER(5)