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 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" destination as the reason for discarding the mail, updates  the  queue
       file,  and  either 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

       RFC 3463 (Enhanced Status Codes)

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 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 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  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, "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

       Wietse Venema
       Google, Inc.
       111 8th Avenue
       New York, NY 10011, USA

                                                                                DISCARD(8postfix)