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 domain or host name that
       is treated as the reason  for  discarding  the  mail,  and
       recipient information.  The reason may be prefixed 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"
       domain  or  host  information as the reason for discarding
       the mail, updates the queue file and marks  recipients  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
       None.

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

       Depending  on the setting of the notify_classes parameter,
       the postmaster is notified of bounces and of  other  trou-
       ble.

CONFIGURATION PARAMETERS
       Changes  to  main.cf  are  picked up automatically as dis-
       card(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 configuration 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 logging sub-second delay values.

       double_bounce_sender (double-bounce)
              The sender address of postmaster notifications that
              are generated 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 the next service request
              before exiting.

       max_use (100)
              The maximal number of connection requests before  a
              Postfix daemon process terminates.

       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 direc-
              tory.

       syslog_facility (mail)
              The syslog facility of Postfix logging.

       syslog_name (postfix)
              The mail system  name  that  is  prepended  to  the
              process  name  in  syslog  records, so that "smtpd"
              becomes, for example, "postfix/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

                                                                    DISCARD(8)