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<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title> Postfix manual - discard(8) </title>
</head> <body> <pre>
DISCARD(8) DISCARD(8)
<b>NAME</b>
discard - Postfix discard mail delivery agent
<b>SYNOPSIS</b>
<b>discard</b> [generic Postfix daemon options]
<b>DESCRIPTION</b>
The Postfix <a href="discard.8.html"><b>discard</b>(8)</a> 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 <a href="https://tools.ietf.org/html/rfc3463">RFC 3463</a>-compatible detail code. This program expects to
be run from the <a href="master.8.html"><b>master</b>(8)</a> process manager.
The <a href="discard.8.html"><b>discard</b>(8)</a> 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 <a href="trace.8.html"><b>trace</b>(8)</a> daemon as appropriate.
<b>SECURITY</b>
The <a href="discard.8.html"><b>discard</b>(8)</a> mailer is not security-sensitive. It does not talk to
the network, and can be run chrooted at fixed low privilege.
<b>STANDARDS</b>
<a href="https://tools.ietf.org/html/rfc3463">RFC 3463</a> (Enhanced Status Codes)
<b>DIAGNOSTICS</b>
Problems and transactions are logged to <b>syslogd</b>(8) or <a href="postlogd.8.html"><b>postlogd</b>(8)</a>.
Depending on the setting of the <b><a href="postconf.5.html#notify_classes">notify_classes</a></b> parameter, the postmas-
ter is notified of bounces and of other trouble.
<b>CONFIGURATION PARAMETERS</b>
Changes to <a href="postconf.5.html"><b>main.cf</b></a> are picked up automatically as <a href="discard.8.html"><b>discard</b>(8)</a> processes
run for only a limited amount of time. Use the command "<b>postfix reload</b>"
to speed up a change.
The text below provides only a parameter summary. See <a href="postconf.5.html"><b>postconf</b>(5)</a> for
more details including examples.
<b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b>
The default location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> con-
figuration files.
<b><a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)</b>
How much time a Postfix daemon process may take to handle a
request before it is terminated by a built-in watchdog timer.
<b><a href="postconf.5.html#delay_logging_resolution_limit">delay_logging_resolution_limit</a> (2)</b>
The maximal number of digits after the decimal point when log-
ging sub-second delay values.
<b><a href="postconf.5.html#double_bounce_sender">double_bounce_sender</a> (double-bounce)</b>
The sender address of postmaster notifications that are gener-
ated by the mail system.
<b><a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)</b>
The time limit for sending or receiving information over an
internal communication channel.
<b><a href="postconf.5.html#max_idle">max_idle</a> (100s)</b>
The maximum amount of time that an idle Postfix daemon process
waits for an incoming connection before terminating voluntarily.
<b><a href="postconf.5.html#max_use">max_use</a> (100)</b>
The maximal number of incoming connections that a Postfix daemon
process will service before terminating voluntarily.
<b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b>
The process ID of a Postfix command or daemon process.
<b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b>
The process name of a Postfix command or daemon process.
<b><a href="postconf.5.html#queue_directory">queue_directory</a> (see 'postconf -d' output)</b>
The location of the Postfix top-level queue directory.
<b><a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)</b>
The syslog facility of Postfix logging.
<b><a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)</b>
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:
<b><a href="postconf.5.html#service_name">service_name</a> (read-only)</b>
The <a href="master.5.html">master.cf</a> service name of a Postfix daemon process.
<b>SEE ALSO</b>
<a href="qmgr.8.html">qmgr(8)</a>, queue manager
<a href="bounce.8.html">bounce(8)</a>, delivery status reports
<a href="error.8.html">error(8)</a>, Postfix error delivery agent
<a href="postconf.5.html">postconf(5)</a>, configuration parameters
<a href="master.5.html">master(5)</a>, generic daemon options
<a href="master.8.html">master(8)</a>, process manager
<a href="postlogd.8.html">postlogd(8)</a>, Postfix logging
syslogd(8), system logging
<b>LICENSE</b>
The Secure Mailer license must be distributed with this software.
<b>HISTORY</b>
This service was introduced with Postfix version 2.2.
<b>AUTHOR(S)</b>
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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