DISCARD(8) System Manager's Manual 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 ad-
dress, a next-hop destination that is treated as the reason for discard-
ing 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 dis-
carding 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) or postlogd(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 config-
uration files.
daemon_timeout (18000s)
How much time a Postfix daemon process may take to handle a re-
quest 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 in-
ternal 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)
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