.\"	$NetBSD: discard.8,v 1.2.14.1 2023/12/25 12:54:41 martin Exp $
.\"
.TH DISCARD 8 
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.SH NAME
discard
\-
Postfix discard mail delivery agent
.SH "SYNOPSIS"
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\fBdiscard\fR [generic Postfix daemon options]
.SH DESCRIPTION
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The Postfix \fBdiscard\fR(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 \fBmaster\fR(8) process
manager.

The \fBdiscard\fR(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 \fBtrace\fR(8)
daemon as appropriate.
.SH "SECURITY"
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The \fBdiscard\fR(8) mailer is not security\-sensitive. It does not talk
to the network, and can be run chrooted at fixed low privilege.
.SH "STANDARDS"
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RFC 3463 (Enhanced Status Codes)
.SH DIAGNOSTICS
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Problems and transactions are logged to \fBsyslogd\fR(8)
or \fBpostlogd\fR(8).

Depending on the setting of the \fBnotify_classes\fR parameter,
the postmaster is notified of bounces and of other trouble.
.SH "CONFIGURATION PARAMETERS"
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Changes to \fBmain.cf\fR are picked up automatically as \fBdiscard\fR(8)
processes run for only a limited amount of time. Use the command
"\fBpostfix reload\fR" to speed up a change.

The text below provides only a parameter summary. See
\fBpostconf\fR(5) for more details including examples.
.IP "\fBconfig_directory (see 'postconf -d' output)\fR"
The default location of the Postfix main.cf and master.cf
configuration files.
.IP "\fBdaemon_timeout (18000s)\fR"
How much time a Postfix daemon process may take to handle a
request before it is terminated by a built\-in watchdog timer.
.IP "\fBdelay_logging_resolution_limit (2)\fR"
The maximal number of digits after the decimal point when logging
sub\-second delay values.
.IP "\fBdouble_bounce_sender (double\-bounce)\fR"
The sender address of postmaster notifications that are generated
by the mail system.
.IP "\fBipc_timeout (3600s)\fR"
The time limit for sending or receiving information over an internal
communication channel.
.IP "\fBmax_idle (100s)\fR"
The maximum amount of time that an idle Postfix daemon process waits
for an incoming connection before terminating voluntarily.
.IP "\fBmax_use (100)\fR"
The maximal number of incoming connections that a Postfix daemon
process will service before terminating voluntarily.
.IP "\fBprocess_id (read\-only)\fR"
The process ID of a Postfix command or daemon process.
.IP "\fBprocess_name (read\-only)\fR"
The process name of a Postfix command or daemon process.
.IP "\fBqueue_directory (see 'postconf -d' output)\fR"
The location of the Postfix top\-level queue directory.
.IP "\fBsyslog_facility (mail)\fR"
The syslog facility of Postfix logging.
.IP "\fBsyslog_name (see 'postconf -d' output)\fR"
A prefix that is prepended to the process name in syslog
records, so that, for example, "smtpd" becomes "prefix/smtpd".
.PP
Available in Postfix 3.3 and later:
.IP "\fBservice_name (read\-only)\fR"
The master.cf service name of a Postfix daemon process.
.SH "SEE ALSO"
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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
.SH "LICENSE"
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The Secure Mailer license must be distributed with this software.
.SH HISTORY
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This service was introduced with Postfix version 2.2.
.SH "AUTHOR(S)"
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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