<b><a name="description">DESCRIPTION</a></b>
The Postfix <a href="error.8.html"><b>error</b>(8)</a> delivery agent processes delivery requests from
the queue manager. Each request specifies a queue file, a sender address, the reason for non-delivery (specified as the next-hop desti-
nation), and recipient information. The reason may be prefixed with an
<a href="https://tools.ietf.org/html/rfc3463">RFC 3463</a>-compatible detail code; if none is specified a default 4.0.0
or 5.0.0code is used instead. This program expects to be run from the
<a href="master.8.html"><b>master</b>(8)</a> process manager.
Depending on the service name in <a href="master.5.html">master.cf</a>, <b>error</b> or <b>retry</b>, the server
bounces or defers all recipients in the delivery request using the "next-hop" information as the reason for non-delivery. The <b>retry</b> ser-
vice name is supported as of Postfix 2.4.
Delivery status reports are sent to the <a href="bounce.8.html"><b>bounce</b>(8)</a>, <a href="defer.8.html"><b>defer</b>(8)</a> or <a href="trace.8.html"><b>trace</b>(8)</a>
daemon as appropriate.
<b><a name="security">SECURITY</a></b>
The <a href="error.8.html"><b>error</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><a name="diagnostics">DIAGNOSTICS</a></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><a name="configuration_parameters">CONFIGURATION PARAMETERS</a></b>
Changes to <a href="postconf.5.html"><b>main.cf</b></a> are picked up automatically as <a href="error.8.html"><b>error</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#2bounce_notice_recipient">2bounce_notice_recipient</a> (postmaster)</b>
The recipient of undeliverable mail that cannot be returned to
the sender.
<b><a href="postconf.5.html#bounce_notice_recipient">bounce_notice_recipient</a> (postmaster)</b>
The recipient of postmaster notifications with the message head-
ers of mail that Postfix did not deliver and of SMTP conversa-
tion transcripts of mail that Postfix did not receive.
<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 timea 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 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#notify_classes">notify_classes</a> (resource, software)</b>
The list of error classes that are reported to the postmaster.
<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.
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