Postfix manual - discard(8)

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) or postlogd(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 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".
 Available in Postfix 3.3 and later:
 service_name (read-only)
 The master.cf service name of a Postfix daemon process.
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
 postlogd(8), Postfix logging
 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)