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)
              A prefix that  is  prepended  to  the  process  name  in  syslog
              records, so that, for example, "smtpd" becomes "prefix/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)