    DISCARD(8)                                                          DISCARD(8)

    NAME
           discard - Postfix discard mail delivery agent

    SYNOPSIS
           discard [generic Postfix daemon options]

    DESCRIPTION
           The  Postfix discard(8) delivery agent processes delivery requests from
           the queue manager. Each  request  specifies  a  queue  file,  a  sender
           address,  a next-hop destination that is treated as the reason for dis-
           carding the mail, and recipient information.  The reason  may  be  pre-
           fixed with an RFC 3463-compatible detail code.  This program expects to
           be run from the master(8) process manager.

           The discard(8) delivery agent pretends to deliver all recipients in the
           delivery  request,  logs  the  "next-hop" destination as the reason for
           discarding the mail, updates the queue file, and either  marks  recipi-
           ents  as  finished or informs the queue manager that delivery should be
           tried again at a later time.

           Delivery status reports are sent to the trace(8) daemon as appropriate.

    SECURITY
           The  discard(8)  mailer  is not security-sensitive. It does not talk to
           the network, and can be run chrooted at fixed low privilege.

    STANDARDS
           RFC 3463 (Enhanced Status Codes)

    DIAGNOSTICS
           Problems and transactions are logged to syslogd(8).

           Depending on the setting of the notify_classes parameter, the  postmas-
           ter is notified of bounces and of other trouble.

    CONFIGURATION PARAMETERS
           Changes  to main.cf are picked up automatically as discard(8) processes
           run for only a limited amount of time. Use the command "postfix reload"
           to speed up a change.

           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.

           daemon_timeout (18000s)
                  How  much  time  a  Postfix  daemon process may take to handle a
                  request before it is terminated by a built-in watchdog timer.

           delay_logging_resolution_limit (2)
                  The maximal number of digits after the decimal point  when  log-
                  ging sub-second delay values.

           double_bounce_sender (double-bounce)
                  The  sender  address of postmaster notifications that are gener-
                  ated by the mail system.

           ipc_timeout (3600s)
                  The time limit for sending  or  receiving  information  over  an
                  internal communication channel.

           max_idle (100s)
                  The  maximum  amount of time that an idle Postfix daemon process
                  waits for an incoming connection before terminating voluntarily.

           max_use (100)
                  The maximal number of incoming connections that a Postfix daemon
                  process will service before terminating voluntarily.

           process_id (read-only)
                  The process ID of a Postfix command or daemon process.

           process_name (read-only)
                  The process name of a Postfix command or daemon process.

           queue_directory (see 'postconf -d' output)
                  The location of the Postfix top-level queue directory.

           syslog_facility (mail)
                  The syslog facility of Postfix logging.

           syslog_name (see 'postconf -d' output)
                  The mail system name that is prepended to the  process  name  in
                  syslog  records,  so  that  "smtpd" becomes, for example, "post-
                  fix/smtpd".

    SEE ALSO
           qmgr(8), queue manager
           bounce(8), delivery status reports
           error(8), Postfix error delivery agent
           postconf(5), configuration parameters
           master(5), generic daemon options
           master(8), process manager
           syslogd(8), system logging

    LICENSE
           The Secure Mailer license must be distributed with this software.

    HISTORY
           This service was introduced with Postfix version 2.2.

    AUTHOR(S)
           Victor Duchovni
           Morgan Stanley

           Based on code by:
           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

                                                                        DISCARD(8)