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+<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
+ "http://www.w3.org/TR/html4/loose.dtd">
+<html> <head>
+<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
+<title> Postfix manual - smtpd(8) </title>
+</head> <body> <pre>
+SMTPD(8) SMTPD(8)
+
+<b>NAME</b>
+ smtpd - Postfix SMTP server
+
+<b>SYNOPSIS</b>
+ <b>smtpd</b> [generic Postfix daemon options]
+
+ <b>sendmail -bs</b>
+
+<b>DESCRIPTION</b>
+ The SMTP server accepts network connection requests and performs zero
+ or more SMTP transactions per connection. Each received message is
+ piped through the <a href="cleanup.8.html"><b>cleanup</b>(8)</a> daemon, and is placed into the <b>incoming</b>
+ queue as one single queue file. For this mode of operation, the pro-
+ gram expects to be run from the <a href="master.8.html"><b>master</b>(8)</a> process manager.
+
+ Alternatively, the SMTP server be can run in stand-alone mode; this is
+ traditionally obtained with "<b>sendmail -bs</b>". When the SMTP server runs
+ stand-alone with non $<b><a href="postconf.5.html#mail_owner">mail_owner</a></b> privileges, it receives mail even
+ while the mail system is not running, deposits messages directly into
+ the <b>maildrop</b> queue, and disables the SMTP server's access policies. As
+ of Postfix version 2.3, the SMTP server refuses to receive mail from
+ the network when it runs with non $<b><a href="postconf.5.html#mail_owner">mail_owner</a></b> privileges.
+
+ The SMTP server implements a variety of policies for connection
+ requests, and for parameters given to <b>HELO, ETRN, MAIL FROM, VRFY</b> and
+ <b>RCPT TO</b> commands. They are detailed below and in the <a href="postconf.5.html"><b>main.cf</b></a> configura-
+ tion file.
+
+<b>SECURITY</b>
+ The SMTP server is moderately security-sensitive. It talks to SMTP
+ clients and to DNS servers on the network. The SMTP server can be run
+ chrooted at fixed low privilege.
+
+<b>STANDARDS</b>
+ <a href="http://tools.ietf.org/html/rfc821">RFC 821</a> (SMTP protocol)
+ <a href="http://tools.ietf.org/html/rfc1123">RFC 1123</a> (Host requirements)
+ <a href="http://tools.ietf.org/html/rfc1652">RFC 1652</a> (8bit-MIME transport)
+ <a href="http://tools.ietf.org/html/rfc1869">RFC 1869</a> (SMTP service extensions)
+ <a href="http://tools.ietf.org/html/rfc1870">RFC 1870</a> (Message size declaration)
+ <a href="http://tools.ietf.org/html/rfc1985">RFC 1985</a> (ETRN command)
+ <a href="http://tools.ietf.org/html/rfc2034">RFC 2034</a> (SMTP enhanced status codes)
+ <a href="http://tools.ietf.org/html/rfc2554">RFC 2554</a> (AUTH command)
+ <a href="http://tools.ietf.org/html/rfc2821">RFC 2821</a> (SMTP protocol)
+ <a href="http://tools.ietf.org/html/rfc2920">RFC 2920</a> (SMTP pipelining)
+ <a href="http://tools.ietf.org/html/rfc3030">RFC 3030</a> (CHUNKING without BINARYMIME)
+ <a href="http://tools.ietf.org/html/rfc3207">RFC 3207</a> (STARTTLS command)
+ <a href="http://tools.ietf.org/html/rfc3461">RFC 3461</a> (SMTP DSN extension)
+ <a href="http://tools.ietf.org/html/rfc3463">RFC 3463</a> (Enhanced status codes)
+ <a href="http://tools.ietf.org/html/rfc3848">RFC 3848</a> (ESMTP transmission types)
+ <a href="http://tools.ietf.org/html/rfc4409">RFC 4409</a> (Message submission)
+ <a href="http://tools.ietf.org/html/rfc4954">RFC 4954</a> (AUTH command)
+ <a href="http://tools.ietf.org/html/rfc5321">RFC 5321</a> (SMTP protocol)
+ <a href="http://tools.ietf.org/html/rfc6531">RFC 6531</a> (Internationalized SMTP)
+ <a href="http://tools.ietf.org/html/rfc6533">RFC 6533</a> (Internationalized Delivery Status Notifications)
+ <a href="http://tools.ietf.org/html/rfc7505">RFC 7505</a> ("Null MX" No Service Resource Record)
+
+<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, protocol problems, policy violations, 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="smtpd.8.html"><b>smtpd</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>COMPATIBILITY CONTROLS</b>
+ The following parameters work around implementation errors in other
+ software, and/or allow you to override standards in order to prevent
+ undesirable use.
+
+ <b><a href="postconf.5.html#broken_sasl_auth_clients">broken_sasl_auth_clients</a> (no)</b>
+ Enable interoperability with remote SMTP clients that implement
+ an obsolete version of the AUTH command (<a href="http://tools.ietf.org/html/rfc4954">RFC 4954</a>).
+
+ <b><a href="postconf.5.html#disable_vrfy_command">disable_vrfy_command</a> (no)</b>
+ Disable the SMTP VRFY command.
+
+ <b><a href="postconf.5.html#smtpd_noop_commands">smtpd_noop_commands</a> (empty)</b>
+ List of commands that the Postfix SMTP server replies to with
+ "250 Ok", without doing any syntax checks and without changing
+ state.
+
+ <b><a href="postconf.5.html#strict_rfc821_envelopes">strict_rfc821_envelopes</a> (no)</b>
+ Require that addresses received in SMTP MAIL FROM and RCPT TO
+ commands are enclosed with &lt;&gt;, and that those addresses do not
+ contain <a href="http://tools.ietf.org/html/rfc822">RFC 822</a> style comments or phrases.
+
+ Available in Postfix version 2.1 and later:
+
+ <b><a href="postconf.5.html#smtpd_reject_unlisted_sender">smtpd_reject_unlisted_sender</a> (no)</b>
+ Request that the Postfix SMTP server rejects mail from unknown
+ sender addresses, even when no explicit <a href="postconf.5.html#reject_unlisted_sender">reject_unlisted_sender</a>
+ access restriction is specified.
+
+ <b><a href="postconf.5.html#smtpd_sasl_exceptions_networks">smtpd_sasl_exceptions_networks</a> (empty)</b>
+ What remote SMTP clients the Postfix SMTP server will not offer
+ AUTH support to.
+
+ Available in Postfix version 2.2 and later:
+
+ <b><a href="postconf.5.html#smtpd_discard_ehlo_keyword_address_maps">smtpd_discard_ehlo_keyword_address_maps</a> (empty)</b>
+ Lookup tables, indexed by the remote SMTP client address, with
+ case insensitive lists of EHLO keywords (pipelining, starttls,
+ auth, etc.) that the Postfix SMTP server will not send in the
+ EHLO response to a remote SMTP client.
+
+ <b><a href="postconf.5.html#smtpd_discard_ehlo_keywords">smtpd_discard_ehlo_keywords</a> (empty)</b>
+ A case insensitive list of EHLO keywords (pipelining, starttls,
+ auth, etc.) that the Postfix SMTP server will not send in the
+ EHLO response to a remote SMTP client.
+
+ <b><a href="postconf.5.html#smtpd_delay_open_until_valid_rcpt">smtpd_delay_open_until_valid_rcpt</a> (yes)</b>
+ Postpone the start of an SMTP mail transaction until a valid
+ RCPT TO command is received.
+
+ Available in Postfix version 2.3 and later:
+
+ <b><a href="postconf.5.html#smtpd_tls_always_issue_session_ids">smtpd_tls_always_issue_session_ids</a> (yes)</b>
+ Force the Postfix SMTP server to issue a TLS session id, even
+ when TLS session caching is turned off (<a href="postconf.5.html#smtpd_tls_session_cache_database">smtpd_tls_ses</a>-
+ <a href="postconf.5.html#smtpd_tls_session_cache_database">sion_cache_database</a> is empty).
+
+ Available in Postfix version 2.6 and later:
+
+ <b><a href="postconf.5.html#tcp_windowsize">tcp_windowsize</a> (0)</b>
+ An optional workaround for routers that break TCP window scal-
+ ing.
+
+ Available in Postfix version 2.7 and later:
+
+ <b><a href="postconf.5.html#smtpd_command_filter">smtpd_command_filter</a> (empty)</b>
+ A mechanism to transform commands from remote SMTP clients.
+
+ Available in Postfix version 2.9 and later:
+
+ <b><a href="postconf.5.html#smtpd_per_record_deadline">smtpd_per_record_deadline</a> (normal: no, overload: yes)</b>
+ Change the behavior of the <a href="postconf.5.html#smtpd_timeout">smtpd_timeout</a> and <a href="postconf.5.html#smtpd_starttls_timeout">smtpd_start</a>-
+ <a href="postconf.5.html#smtpd_starttls_timeout">tls_timeout</a> time limits, from a time limit per read or write
+ system call, to a time limit to send or receive a complete
+ record (an SMTP command line, SMTP response line, SMTP message
+ content line, or TLS protocol message).
+
+ Available in Postfix version 3.0 and later:
+
+ <b><a href="postconf.5.html#smtpd_dns_reply_filter">smtpd_dns_reply_filter</a> (empty)</b>
+ Optional filter for Postfix SMTP server DNS lookup results.
+
+<b>ADDRESS REWRITING CONTROLS</b>
+ See the <a href="ADDRESS_REWRITING_README.html">ADDRESS_REWRITING_README</a> document for a detailed discussion of
+ Postfix address rewriting.
+
+ <b><a href="postconf.5.html#receive_override_options">receive_override_options</a> (empty)</b>
+ Enable or disable recipient validation, built-in content filter-
+ ing, or address mapping.
+
+ Available in Postfix version 2.2 and later:
+
+ <b><a href="postconf.5.html#local_header_rewrite_clients">local_header_rewrite_clients</a> (<a href="postconf.5.html#permit_inet_interfaces">permit_inet_interfaces</a>)</b>
+ Rewrite message header addresses in mail from these clients and
+ update incomplete addresses with the domain name in $<a href="postconf.5.html#myorigin">myorigin</a> or
+ $<a href="postconf.5.html#mydomain">mydomain</a>; either don't rewrite message headers from other
+ clients at all, or rewrite message headers and update incomplete
+ addresses with the domain specified in the <a href="postconf.5.html#remote_header_rewrite_domain">remote_header_re</a>-
+ <a href="postconf.5.html#remote_header_rewrite_domain">write_domain</a> parameter.
+
+<b>BEFORE-SMTPD PROXY AGENT</b>
+ Available in Postfix version 2.10 and later:
+
+ <b><a href="postconf.5.html#smtpd_upstream_proxy_protocol">smtpd_upstream_proxy_protocol</a> (empty)</b>
+ The name of the proxy protocol used by an optional before-smtpd
+ proxy agent.
+
+ <b><a href="postconf.5.html#smtpd_upstream_proxy_timeout">smtpd_upstream_proxy_timeout</a> (5s)</b>
+ The time limit for the proxy protocol specified with the
+ <a href="postconf.5.html#smtpd_upstream_proxy_protocol">smtpd_upstream_proxy_protocol</a> parameter.
+
+<b>AFTER QUEUE EXTERNAL CONTENT INSPECTION CONTROLS</b>
+ As of version 1.0, Postfix can be configured to send new mail to an
+ external content filter AFTER the mail is queued. This content filter
+ is expected to inject mail back into a (Postfix or other) MTA for fur-
+ ther delivery. See the <a href="FILTER_README.html">FILTER_README</a> document for details.
+
+ <b><a href="postconf.5.html#content_filter">content_filter</a> (empty)</b>
+ After the message is queued, send the entire message to the
+ specified <i>transport:destination</i>.
+
+<b>BEFORE QUEUE EXTERNAL CONTENT INSPECTION CONTROLS</b>
+ As of version 2.1, the Postfix SMTP server can be configured to send
+ incoming mail to a real-time SMTP-based content filter BEFORE mail is
+ queued. This content filter is expected to inject mail back into Post-
+ fix. See the <a href="SMTPD_PROXY_README.html">SMTPD_PROXY_README</a> document for details on how to config-
+ ure and operate this feature.
+
+ <b><a href="postconf.5.html#smtpd_proxy_filter">smtpd_proxy_filter</a> (empty)</b>
+ The hostname and TCP port of the mail filtering proxy server.
+
+ <b><a href="postconf.5.html#smtpd_proxy_ehlo">smtpd_proxy_ehlo</a> ($<a href="postconf.5.html#myhostname">myhostname</a>)</b>
+ How the Postfix SMTP server announces itself to the proxy fil-
+ ter.
+
+ <b><a href="postconf.5.html#smtpd_proxy_options">smtpd_proxy_options</a> (empty)</b>
+ List of options that control how the Postfix SMTP server commu-
+ nicates with a before-queue content filter.
+
+ <b><a href="postconf.5.html#smtpd_proxy_timeout">smtpd_proxy_timeout</a> (100s)</b>
+ The time limit for connecting to a proxy filter and for sending
+ or receiving information.
+
+<b>BEFORE QUEUE MILTER CONTROLS</b>
+ As of version 2.3, Postfix supports the Sendmail version 8 Milter (mail
+ filter) protocol. These content filters run outside Postfix. They can
+ inspect the SMTP command stream and the message content, and can
+ request modifications before mail is queued. For details see the <a href="MILTER_README.html">MIL</a>-
+ <a href="MILTER_README.html">TER_README</a> document.
+
+ <b><a href="postconf.5.html#smtpd_milters">smtpd_milters</a> (empty)</b>
+ A list of Milter (mail filter) applications for new mail that
+ arrives via the Postfix <a href="smtpd.8.html"><b>smtpd</b>(8)</a> server.
+
+ <b><a href="postconf.5.html#milter_protocol">milter_protocol</a> (6)</b>
+ The mail filter protocol version and optional protocol exten-
+ sions for communication with a Milter application; prior to
+ Postfix 2.6 the default protocol is 2.
+
+ <b><a href="postconf.5.html#milter_default_action">milter_default_action</a> (tempfail)</b>
+ The default action when a Milter (mail filter) application is
+ unavailable or mis-configured.
+
+ <b><a href="postconf.5.html#milter_macro_daemon_name">milter_macro_daemon_name</a> ($<a href="postconf.5.html#myhostname">myhostname</a>)</b>
+ The {daemon_name} macro value for Milter (mail filter) applica-
+ tions.
+
+ <b><a href="postconf.5.html#milter_macro_v">milter_macro_v</a> ($<a href="postconf.5.html#mail_name">mail_name</a> $<a href="postconf.5.html#mail_version">mail_version</a>)</b>
+ The {v} macro value for Milter (mail filter) applications.
+
+ <b><a href="postconf.5.html#milter_connect_timeout">milter_connect_timeout</a> (30s)</b>
+ The time limit for connecting to a Milter (mail filter) applica-
+ tion, and for negotiating protocol options.
+
+ <b><a href="postconf.5.html#milter_command_timeout">milter_command_timeout</a> (30s)</b>
+ The time limit for sending an SMTP command to a Milter (mail
+ filter) application, and for receiving the response.
+
+ <b><a href="postconf.5.html#milter_content_timeout">milter_content_timeout</a> (300s)</b>
+ The time limit for sending message content to a Milter (mail
+ filter) application, and for receiving the response.
+
+ <b><a href="postconf.5.html#milter_connect_macros">milter_connect_macros</a> (see 'postconf -d' output)</b>
+ The macros that are sent to Milter (mail filter) applications
+ after completion of an SMTP connection.
+
+ <b><a href="postconf.5.html#milter_helo_macros">milter_helo_macros</a> (see 'postconf -d' output)</b>
+ The macros that are sent to Milter (mail filter) applications
+ after the SMTP HELO or EHLO command.
+
+ <b><a href="postconf.5.html#milter_mail_macros">milter_mail_macros</a> (see 'postconf -d' output)</b>
+ The macros that are sent to Milter (mail filter) applications
+ after the SMTP MAIL FROM command.
+
+ <b><a href="postconf.5.html#milter_rcpt_macros">milter_rcpt_macros</a> (see 'postconf -d' output)</b>
+ The macros that are sent to Milter (mail filter) applications
+ after the SMTP RCPT TO command.
+
+ <b><a href="postconf.5.html#milter_data_macros">milter_data_macros</a> (see 'postconf -d' output)</b>
+ The macros that are sent to version 4 or higher Milter (mail
+ filter) applications after the SMTP DATA command.
+
+ <b><a href="postconf.5.html#milter_unknown_command_macros">milter_unknown_command_macros</a> (see 'postconf -d' output)</b>
+ The macros that are sent to version 3 or higher Milter (mail
+ filter) applications after an unknown SMTP command.
+
+ <b><a href="postconf.5.html#milter_end_of_header_macros">milter_end_of_header_macros</a> (see 'postconf -d' output)</b>
+ The macros that are sent to Milter (mail filter) applications
+ after the end of the message header.
+
+ <b><a href="postconf.5.html#milter_end_of_data_macros">milter_end_of_data_macros</a> (see 'postconf -d' output)</b>
+ The macros that are sent to Milter (mail filter) applications
+ after the message end-of-data.
+
+ Available in Postfix version 3.1 and later:
+
+ <b><a href="postconf.5.html#milter_macro_defaults">milter_macro_defaults</a> (empty)</b>
+ Optional list of <i>name=value</i> pairs that specify default values
+ for arbitrary macros that Postfix may send to Milter applica-
+ tions.
+
+ Available in Postfix version 3.2 and later:
+
+ <b><a href="postconf.5.html#smtpd_milter_maps">smtpd_milter_maps</a> (empty)</b>
+ Lookup tables with Milter settings per remote SMTP client IP
+ address.
+
+<b>GENERAL CONTENT INSPECTION CONTROLS</b>
+ The following parameters are applicable for both built-in and external
+ content filters.
+
+ Available in Postfix version 2.1 and later:
+
+ <b><a href="postconf.5.html#receive_override_options">receive_override_options</a> (empty)</b>
+ Enable or disable recipient validation, built-in content filter-
+ ing, or address mapping.
+
+<b>EXTERNAL CONTENT INSPECTION CONTROLS</b>
+ The following parameters are applicable for both before-queue and
+ after-queue content filtering.
+
+ Available in Postfix version 2.1 and later:
+
+ <b><a href="postconf.5.html#smtpd_authorized_xforward_hosts">smtpd_authorized_xforward_hosts</a> (empty)</b>
+ What remote SMTP clients are allowed to use the XFORWARD fea-
+ ture.
+
+<b>SASL AUTHENTICATION CONTROLS</b>
+ Postfix SASL support (<a href="http://tools.ietf.org/html/rfc4954">RFC 4954</a>) can be used to authenticate remote SMTP
+ clients to the Postfix SMTP server, and to authenticate the Postfix
+ SMTP client to a remote SMTP server. See the <a href="SASL_README.html">SASL_README</a> document for
+ details.
+
+ <b><a href="postconf.5.html#broken_sasl_auth_clients">broken_sasl_auth_clients</a> (no)</b>
+ Enable interoperability with remote SMTP clients that implement
+ an obsolete version of the AUTH command (<a href="http://tools.ietf.org/html/rfc4954">RFC 4954</a>).
+
+ <b><a href="postconf.5.html#smtpd_sasl_auth_enable">smtpd_sasl_auth_enable</a> (no)</b>
+ Enable SASL authentication in the Postfix SMTP server.
+
+ <b><a href="postconf.5.html#smtpd_sasl_local_domain">smtpd_sasl_local_domain</a> (empty)</b>
+ The name of the Postfix SMTP server's local SASL authentication
+ realm.
+
+ <b><a href="postconf.5.html#smtpd_sasl_security_options">smtpd_sasl_security_options</a> (noanonymous)</b>
+ Postfix SMTP server SASL security options; as of Postfix 2.3 the
+ list of available features depends on the SASL server implemen-
+ tation that is selected with <b><a href="postconf.5.html#smtpd_sasl_type">smtpd_sasl_type</a></b>.
+
+ <b><a href="postconf.5.html#smtpd_sender_login_maps">smtpd_sender_login_maps</a> (empty)</b>
+ Optional lookup table with the SASL login names that own the
+ sender (MAIL FROM) addresses.
+
+ Available in Postfix version 2.1 and later:
+
+ <b><a href="postconf.5.html#smtpd_sasl_exceptions_networks">smtpd_sasl_exceptions_networks</a> (empty)</b>
+ What remote SMTP clients the Postfix SMTP server will not offer
+ AUTH support to.
+
+ Available in Postfix version 2.1 and 2.2:
+
+ <b><a href="postconf.5.html#smtpd_sasl_application_name">smtpd_sasl_application_name</a> (smtpd)</b>
+ The application name that the Postfix SMTP server uses for SASL
+ server initialization.
+
+ Available in Postfix version 2.3 and later:
+
+ <b><a href="postconf.5.html#smtpd_sasl_authenticated_header">smtpd_sasl_authenticated_header</a> (no)</b>
+ Report the SASL authenticated user name in the <a href="smtpd.8.html"><b>smtpd</b>(8)</a> Received
+ message header.
+
+ <b><a href="postconf.5.html#smtpd_sasl_path">smtpd_sasl_path</a> (smtpd)</b>
+ Implementation-specific information that the Postfix SMTP server
+ passes through to the SASL plug-in implementation that is
+ selected with <b><a href="postconf.5.html#smtpd_sasl_type">smtpd_sasl_type</a></b>.
+
+ <b><a href="postconf.5.html#smtpd_sasl_type">smtpd_sasl_type</a> (cyrus)</b>
+ The SASL plug-in type that the Postfix SMTP server should use
+ for authentication.
+
+ Available in Postfix version 2.5 and later:
+
+ <b><a href="postconf.5.html#cyrus_sasl_config_path">cyrus_sasl_config_path</a> (empty)</b>
+ Search path for Cyrus SASL application configuration files, cur-
+ rently used only to locate the $<a href="postconf.5.html#smtpd_sasl_path">smtpd_sasl_path</a>.conf file.
+
+ Available in Postfix version 2.11 and later:
+
+ <b>smtpd_sasl_service (smtp)</b>
+ The service name that is passed to the SASL plug-in that is
+ selected with <b><a href="postconf.5.html#smtpd_sasl_type">smtpd_sasl_type</a></b> and <b><a href="postconf.5.html#smtpd_sasl_path">smtpd_sasl_path</a></b>.
+
+ Available in Postfix version 3.4 and later:
+
+ <b><a href="postconf.5.html#smtpd_sasl_response_limit">smtpd_sasl_response_limit</a> (12288)</b>
+ The maximum length of a SASL client's response to a server chal-
+ lenge.
+
+<b>STARTTLS SUPPORT CONTROLS</b>
+ Detailed information about STARTTLS configuration may be found in the
+ <a href="TLS_README.html">TLS_README</a> document.
+
+ <b><a href="postconf.5.html#smtpd_tls_security_level">smtpd_tls_security_level</a> (empty)</b>
+ The SMTP TLS security level for the Postfix SMTP server; when a
+ non-empty value is specified, this overrides the obsolete param-
+ eters <a href="postconf.5.html#smtpd_use_tls">smtpd_use_tls</a> and <a href="postconf.5.html#smtpd_enforce_tls">smtpd_enforce_tls</a>.
+
+ <b><a href="postconf.5.html#smtpd_sasl_tls_security_options">smtpd_sasl_tls_security_options</a> ($<a href="postconf.5.html#smtpd_sasl_security_options">smtpd_sasl_security_options</a>)</b>
+ The SASL authentication security options that the Postfix SMTP
+ server uses for TLS encrypted SMTP sessions.
+
+ <b><a href="postconf.5.html#smtpd_starttls_timeout">smtpd_starttls_timeout</a> (see 'postconf -d' output)</b>
+ The time limit for Postfix SMTP server write and read operations
+ during TLS startup and shutdown handshake procedures.
+
+ <b><a href="postconf.5.html#smtpd_tls_CAfile">smtpd_tls_CAfile</a> (empty)</b>
+ A file containing (PEM format) CA certificates of root CAs
+ trusted to sign either remote SMTP client certificates or inter-
+ mediate CA certificates.
+
+ <b><a href="postconf.5.html#smtpd_tls_CApath">smtpd_tls_CApath</a> (empty)</b>
+ A directory containing (PEM format) CA certificates of root CAs
+ trusted to sign either remote SMTP client certificates or inter-
+ mediate CA certificates.
+
+ <b><a href="postconf.5.html#smtpd_tls_always_issue_session_ids">smtpd_tls_always_issue_session_ids</a> (yes)</b>
+ Force the Postfix SMTP server to issue a TLS session id, even
+ when TLS session caching is turned off (<a href="postconf.5.html#smtpd_tls_session_cache_database">smtpd_tls_ses</a>-
+ <a href="postconf.5.html#smtpd_tls_session_cache_database">sion_cache_database</a> is empty).
+
+ <b><a href="postconf.5.html#smtpd_tls_ask_ccert">smtpd_tls_ask_ccert</a> (no)</b>
+ Ask a remote SMTP client for a client certificate.
+
+ <b><a href="postconf.5.html#smtpd_tls_auth_only">smtpd_tls_auth_only</a> (no)</b>
+ When TLS encryption is optional in the Postfix SMTP server, do
+ not announce or accept SASL authentication over unencrypted con-
+ nections.
+
+ <b><a href="postconf.5.html#smtpd_tls_ccert_verifydepth">smtpd_tls_ccert_verifydepth</a> (9)</b>
+ The verification depth for remote SMTP client certificates.
+
+ <b><a href="postconf.5.html#smtpd_tls_cert_file">smtpd_tls_cert_file</a> (empty)</b>
+ File with the Postfix SMTP server RSA certificate in PEM format.
+
+ <b><a href="postconf.5.html#smtpd_tls_exclude_ciphers">smtpd_tls_exclude_ciphers</a> (empty)</b>
+ List of ciphers or cipher types to exclude from the SMTP server
+ cipher list at all TLS security levels.
+
+ <b><a href="postconf.5.html#smtpd_tls_dcert_file">smtpd_tls_dcert_file</a> (empty)</b>
+ File with the Postfix SMTP server DSA certificate in PEM format.
+
+ <b><a href="postconf.5.html#smtpd_tls_dh1024_param_file">smtpd_tls_dh1024_param_file</a> (empty)</b>
+ File with DH parameters that the Postfix SMTP server should use
+ with non-export EDH ciphers.
+
+ <b><a href="postconf.5.html#smtpd_tls_dh512_param_file">smtpd_tls_dh512_param_file</a> (empty)</b>
+ File with DH parameters that the Postfix SMTP server should use
+ with export-grade EDH ciphers.
+
+ <b><a href="postconf.5.html#smtpd_tls_dkey_file">smtpd_tls_dkey_file</a> ($<a href="postconf.5.html#smtpd_tls_dcert_file">smtpd_tls_dcert_file</a>)</b>
+ File with the Postfix SMTP server DSA private key in PEM format.
+
+ <b><a href="postconf.5.html#smtpd_tls_key_file">smtpd_tls_key_file</a> ($<a href="postconf.5.html#smtpd_tls_cert_file">smtpd_tls_cert_file</a>)</b>
+ File with the Postfix SMTP server RSA private key in PEM format.
+
+ <b><a href="postconf.5.html#smtpd_tls_loglevel">smtpd_tls_loglevel</a> (0)</b>
+ Enable additional Postfix SMTP server logging of TLS activity.
+
+ <b><a href="postconf.5.html#smtpd_tls_mandatory_ciphers">smtpd_tls_mandatory_ciphers</a> (medium)</b>
+ The minimum TLS cipher grade that the Postfix SMTP server will
+ use with mandatory TLS encryption.
+
+ <b><a href="postconf.5.html#smtpd_tls_mandatory_exclude_ciphers">smtpd_tls_mandatory_exclude_ciphers</a> (empty)</b>
+ Additional list of ciphers or cipher types to exclude from the
+ Postfix SMTP server cipher list at mandatory TLS security lev-
+ els.
+
+ <b><a href="postconf.5.html#smtpd_tls_mandatory_protocols">smtpd_tls_mandatory_protocols</a> (!SSLv2, !SSLv3)</b>
+ The SSL/TLS protocols accepted by the Postfix SMTP server with
+ mandatory TLS encryption.
+
+ <b><a href="postconf.5.html#smtpd_tls_received_header">smtpd_tls_received_header</a> (no)</b>
+ Request that the Postfix SMTP server produces Received: message
+ headers that include information about the protocol and cipher
+ used, as well as the remote SMTP client CommonName and client
+ certificate issuer CommonName.
+
+ <b><a href="postconf.5.html#smtpd_tls_req_ccert">smtpd_tls_req_ccert</a> (no)</b>
+ With mandatory TLS encryption, require a trusted remote SMTP
+ client certificate in order to allow TLS connections to proceed.
+
+ <b><a href="postconf.5.html#smtpd_tls_wrappermode">smtpd_tls_wrappermode</a> (no)</b>
+ Run the Postfix SMTP server in the non-standard "wrapper" mode,
+ instead of using the STARTTLS command.
+
+ <b><a href="postconf.5.html#tls_daemon_random_bytes">tls_daemon_random_bytes</a> (32)</b>
+ The number of pseudo-random bytes that an <a href="smtp.8.html"><b>smtp</b>(8)</a> or <a href="smtpd.8.html"><b>smtpd</b>(8)</a>
+ process requests from the <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a> server in order to seed its
+ internal pseudo random number generator (PRNG).
+
+ <b><a href="postconf.5.html#tls_high_cipherlist">tls_high_cipherlist</a> (see 'postconf -d' output)</b>
+ The OpenSSL cipherlist for "high" grade ciphers.
+
+ <b><a href="postconf.5.html#tls_medium_cipherlist">tls_medium_cipherlist</a> (see 'postconf -d' output)</b>
+ The OpenSSL cipherlist for "medium" or higher grade ciphers.
+
+ <b><a href="postconf.5.html#tls_low_cipherlist">tls_low_cipherlist</a> (see 'postconf -d' output)</b>
+ The OpenSSL cipherlist for "low" or higher grade ciphers.
+
+ <b><a href="postconf.5.html#tls_export_cipherlist">tls_export_cipherlist</a> (see 'postconf -d' output)</b>
+ The OpenSSL cipherlist for "export" or higher grade ciphers.
+
+ <b><a href="postconf.5.html#tls_null_cipherlist">tls_null_cipherlist</a> (eNULL:!aNULL)</b>
+ The OpenSSL cipherlist for "NULL" grade ciphers that provide
+ authentication without encryption.
+
+ Available in Postfix version 2.5 and later:
+
+ <b><a href="postconf.5.html#smtpd_tls_fingerprint_digest">smtpd_tls_fingerprint_digest</a> (md5)</b>
+ The message digest algorithm to construct remote SMTP
+ client-certificate fingerprints or public key fingerprints
+ (Postfix 2.9 and later) for <b><a href="postconf.5.html#check_ccert_access">check_ccert_access</a></b> and <b>per-</b>
+ <b>mit_tls_clientcerts</b>.
+
+ Available in Postfix version 2.6 and later:
+
+ <b><a href="postconf.5.html#smtpd_tls_protocols">smtpd_tls_protocols</a> (!SSLv2, !SSLv3)</b>
+ List of TLS protocols that the Postfix SMTP server will exclude
+ or include with opportunistic TLS encryption.
+
+ <b><a href="postconf.5.html#smtpd_tls_ciphers">smtpd_tls_ciphers</a> (medium)</b>
+ The minimum TLS cipher grade that the Postfix SMTP server will
+ use with opportunistic TLS encryption.
+
+ <b><a href="postconf.5.html#smtpd_tls_eccert_file">smtpd_tls_eccert_file</a> (empty)</b>
+ File with the Postfix SMTP server ECDSA certificate in PEM for-
+ mat.
+
+ <b><a href="postconf.5.html#smtpd_tls_eckey_file">smtpd_tls_eckey_file</a> ($<a href="postconf.5.html#smtpd_tls_eccert_file">smtpd_tls_eccert_file</a>)</b>
+ File with the Postfix SMTP server ECDSA private key in PEM for-
+ mat.
+
+ <b><a href="postconf.5.html#smtpd_tls_eecdh_grade">smtpd_tls_eecdh_grade</a> (see 'postconf -d' output)</b>
+ The Postfix SMTP server security grade for ephemeral ellip-
+ tic-curve Diffie-Hellman (EECDH) key exchange.
+
+ <b><a href="postconf.5.html#tls_eecdh_strong_curve">tls_eecdh_strong_curve</a> (prime256v1)</b>
+ The elliptic curve used by the Postfix SMTP server for sensibly
+ strong ephemeral ECDH key exchange.
+
+ <b><a href="postconf.5.html#tls_eecdh_ultra_curve">tls_eecdh_ultra_curve</a> (secp384r1)</b>
+ The elliptic curve used by the Postfix SMTP server for maximally
+ strong ephemeral ECDH key exchange.
+
+ Available in Postfix version 2.8 and later:
+
+ <b><a href="postconf.5.html#tls_preempt_cipherlist">tls_preempt_cipherlist</a> (no)</b>
+ With SSLv3 and later, use the Postfix SMTP server's cipher pref-
+ erence order instead of the remote client's cipher preference
+ order.
+
+ <b><a href="postconf.5.html#tls_disable_workarounds">tls_disable_workarounds</a> (see 'postconf -d' output)</b>
+ List or bit-mask of OpenSSL bug work-arounds to disable.
+
+ Available in Postfix version 2.11 and later:
+
+ <b><a href="postconf.5.html#tlsmgr_service_name">tlsmgr_service_name</a> (tlsmgr)</b>
+ The name of the <a href="tlsmgr.8.html"><b>tlsmgr</b>(8)</a> service entry in <a href="master.5.html">master.cf</a>.
+
+ Available in Postfix version 3.0 and later:
+
+ <b><a href="postconf.5.html#tls_session_ticket_cipher">tls_session_ticket_cipher</a> (Postfix</b> &gt;<b>= 3.0: aes-256-cbc, Postfix</b> &lt; <b>3.0:</b>
+ <b>aes-128-cbc)</b>
+ Algorithm used to encrypt <a href="http://tools.ietf.org/html/rfc5077">RFC5077</a> TLS session tickets.
+
+ Available in Postfix version 3.2 and later:
+
+ <b><a href="postconf.5.html#tls_eecdh_auto_curves">tls_eecdh_auto_curves</a> (see 'postconf -d' output)</b>
+ The prioritized list of elliptic curves supported by the Postfix
+ SMTP client and server.
+
+ Available in Postfix version 3.4 and later:
+
+ <b><a href="postconf.5.html#smtpd_tls_chain_files">smtpd_tls_chain_files</a> (empty)</b>
+ List of one or more PEM files, each holding one or more private
+ keys directly followed by a corresponding certificate chain.
+
+ <b><a href="postconf.5.html#tls_server_sni_maps">tls_server_sni_maps</a> (empty)</b>
+ Optional lookup tables that map names received from remote SMTP
+ clients via the TLS Server Name Indication (SNI) extension to
+ the appropriate keys and certificate chains.
+
+ Introduced with Postfix 3.4.6, 3.3.5, 3.2.10, and 3.1.13:
+
+ <b><a href="postconf.5.html#tls_fast_shutdown_enable">tls_fast_shutdown_enable</a> (yes)</b>
+ A workaround for implementations that hang Postfix while shuting
+ down a TLS session, until Postfix times out.
+
+<b>OBSOLETE STARTTLS CONTROLS</b>
+ The following configuration parameters exist for compatibility with
+ Postfix versions before 2.3. Support for these will be removed in a
+ future release.
+
+ <b><a href="postconf.5.html#smtpd_use_tls">smtpd_use_tls</a> (no)</b>
+ Opportunistic TLS: announce STARTTLS support to remote SMTP
+ clients, but do not require that clients use TLS encryption.
+
+ <b><a href="postconf.5.html#smtpd_enforce_tls">smtpd_enforce_tls</a> (no)</b>
+ Mandatory TLS: announce STARTTLS support to remote SMTP clients,
+ and require that clients use TLS encryption.
+
+ <b><a href="postconf.5.html#smtpd_tls_cipherlist">smtpd_tls_cipherlist</a> (empty)</b>
+ Obsolete Postfix &lt; 2.3 control for the Postfix SMTP server TLS
+ cipher list.
+
+<b>SMTPUTF8 CONTROLS</b>
+ Preliminary SMTPUTF8 support is introduced with Postfix 3.0.
+
+ <b><a href="postconf.5.html#smtputf8_enable">smtputf8_enable</a> (yes)</b>
+ Enable preliminary SMTPUTF8 support for the protocols described
+ in <a href="http://tools.ietf.org/html/rfc6531">RFC 6531</a>..6533.
+
+ <b><a href="postconf.5.html#strict_smtputf8">strict_smtputf8</a> (no)</b>
+ Enable stricter enforcement of the SMTPUTF8 protocol.
+
+ <b><a href="postconf.5.html#smtputf8_autodetect_classes">smtputf8_autodetect_classes</a> (sendmail, verify)</b>
+ Detect that a message requires SMTPUTF8 support for the speci-
+ fied mail origin classes.
+
+ Available in Postfix version 3.2 and later:
+
+ <b><a href="postconf.5.html#enable_idna2003_compatibility">enable_idna2003_compatibility</a> (no)</b>
+ Enable 'transitional' compatibility between IDNA2003 and
+ IDNA2008, when converting UTF-8 domain names to/from the ASCII
+ form that is used for DNS lookups.
+
+<b>VERP SUPPORT CONTROLS</b>
+ With VERP style delivery, each recipient of a message receives a cus-
+ tomized copy of the message with his/her own recipient address encoded
+ in the envelope sender address. The <a href="VERP_README.html">VERP_README</a> file describes config-
+ uration and operation details of Postfix support for variable envelope
+ return path addresses. VERP style delivery is requested with the SMTP
+ XVERP command or with the "sendmail -V" command-line option and is
+ available in Postfix version 1.1 and later.
+
+ <b><a href="postconf.5.html#default_verp_delimiters">default_verp_delimiters</a> (+=)</b>
+ The two default VERP delimiter characters.
+
+ <b><a href="postconf.5.html#verp_delimiter_filter">verp_delimiter_filter</a> (-=+)</b>
+ The characters Postfix accepts as VERP delimiter characters on
+ the Postfix <a href="sendmail.1.html"><b>sendmail</b>(1)</a> command line and in SMTP commands.
+
+ Available in Postfix version 1.1 and 2.0:
+
+ <b><a href="postconf.5.html#authorized_verp_clients">authorized_verp_clients</a> ($<a href="postconf.5.html#mynetworks">mynetworks</a>)</b>
+ What remote SMTP clients are allowed to specify the XVERP com-
+ mand.
+
+ Available in Postfix version 2.1 and later:
+
+ <b><a href="postconf.5.html#smtpd_authorized_verp_clients">smtpd_authorized_verp_clients</a> ($<a href="postconf.5.html#authorized_verp_clients">authorized_verp_clients</a>)</b>
+ What remote SMTP clients are allowed to specify the XVERP com-
+ mand.
+
+<b>TROUBLE SHOOTING CONTROLS</b>
+ The <a href="DEBUG_README.html">DEBUG_README</a> document describes how to debug parts of the Postfix
+ mail system. The methods vary from making the software log a lot of
+ detail, to running some daemon processes under control of a call tracer
+ or debugger.
+
+ <b><a href="postconf.5.html#debug_peer_level">debug_peer_level</a> (2)</b>
+ The increment in verbose logging level when a remote client or
+ server matches a pattern in the <a href="postconf.5.html#debug_peer_list">debug_peer_list</a> parameter.
+
+ <b><a href="postconf.5.html#debug_peer_list">debug_peer_list</a> (empty)</b>
+ Optional list of remote client or server hostname or network
+ address patterns that cause the verbose logging level to
+ increase by the amount specified in $<a href="postconf.5.html#debug_peer_level">debug_peer_level</a>.
+
+ <b><a href="postconf.5.html#error_notice_recipient">error_notice_recipient</a> (postmaster)</b>
+ The recipient of postmaster notifications about mail delivery
+ problems that are caused by policy, resource, software or proto-
+ col errors.
+
+ <b><a href="postconf.5.html#internal_mail_filter_classes">internal_mail_filter_classes</a> (empty)</b>
+ What categories of Postfix-generated mail are subject to
+ before-queue content inspection by <a href="postconf.5.html#non_smtpd_milters">non_smtpd_milters</a>,
+ <a href="postconf.5.html#header_checks">header_checks</a> and <a href="postconf.5.html#body_checks">body_checks</a>.
+
+ <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#smtpd_reject_footer">smtpd_reject_footer</a> (empty)</b>
+ Optional information that is appended after each Postfix SMTP
+ server 4XX or 5XX response.
+
+ <b><a href="postconf.5.html#soft_bounce">soft_bounce</a> (no)</b>
+ Safety net to keep mail queued that would otherwise be returned
+ to the sender.
+
+ Available in Postfix version 2.1 and later:
+
+ <b><a href="postconf.5.html#smtpd_authorized_xclient_hosts">smtpd_authorized_xclient_hosts</a> (empty)</b>
+ What remote SMTP clients are allowed to use the XCLIENT feature.
+
+ Available in Postfix version 2.10 and later:
+
+ <b><a href="postconf.5.html#smtpd_log_access_permit_actions">smtpd_log_access_permit_actions</a> (empty)</b>
+ Enable logging of the named "permit" actions in SMTP server
+ access lists (by default, the SMTP server logs "reject" actions
+ but not "permit" actions).
+
+<b>KNOWN VERSUS UNKNOWN RECIPIENT CONTROLS</b>
+ As of Postfix version 2.0, the SMTP server rejects mail for unknown
+ recipients. This prevents the mail queue from clogging up with undeliv-
+ erable MAILER-DAEMON messages. Additional information on this topic is
+ in the <a href="LOCAL_RECIPIENT_README.html">LOCAL_RECIPIENT_README</a> and <a href="ADDRESS_CLASS_README.html">ADDRESS_CLASS_README</a> documents.
+
+ <b><a href="postconf.5.html#show_user_unknown_table_name">show_user_unknown_table_name</a> (yes)</b>
+ Display the name of the recipient table in the "User unknown"
+ responses.
+
+ <b><a href="postconf.5.html#canonical_maps">canonical_maps</a> (empty)</b>
+ Optional address mapping lookup tables for message headers and
+ envelopes.
+
+ <b><a href="postconf.5.html#recipient_canonical_maps">recipient_canonical_maps</a> (empty)</b>
+ Optional address mapping lookup tables for envelope and header
+ recipient addresses.
+
+ <b><a href="postconf.5.html#sender_canonical_maps">sender_canonical_maps</a> (empty)</b>
+ Optional address mapping lookup tables for envelope and header
+ sender addresses.
+
+ Parameters concerning known/unknown local recipients:
+
+ <b><a href="postconf.5.html#mydestination">mydestination</a> ($<a href="postconf.5.html#myhostname">myhostname</a>, localhost.$<a href="postconf.5.html#mydomain">mydomain</a>, localhost)</b>
+ The list of domains that are delivered via the $<a href="postconf.5.html#local_transport">local_transport</a>
+ mail delivery transport.
+
+ <b><a href="postconf.5.html#inet_interfaces">inet_interfaces</a> (all)</b>
+ The network interface addresses that this mail system receives
+ mail on.
+
+ <b><a href="postconf.5.html#proxy_interfaces">proxy_interfaces</a> (empty)</b>
+ The network interface addresses that this mail system receives
+ mail on by way of a proxy or network address translation unit.
+
+ <b><a href="postconf.5.html#inet_protocols">inet_protocols</a> (all)</b>
+ The Internet protocols Postfix will attempt to use when making
+ or accepting connections.
+
+ <b><a href="postconf.5.html#local_recipient_maps">local_recipient_maps</a> (<a href="proxymap.8.html">proxy</a>:unix:passwd.byname $<a href="postconf.5.html#alias_maps">alias_maps</a>)</b>
+ Lookup tables with all names or addresses of local recipients: a
+ recipient address is local when its domain matches $<a href="postconf.5.html#mydestination">mydestina</a>-
+ <a href="postconf.5.html#mydestination">tion</a>, $<a href="postconf.5.html#inet_interfaces">inet_interfaces</a> or $<a href="postconf.5.html#proxy_interfaces">proxy_interfaces</a>.
+
+ <b><a href="postconf.5.html#unknown_local_recipient_reject_code">unknown_local_recipient_reject_code</a> (550)</b>
+ The numerical Postfix SMTP server response code when a recipient
+ address is local, and $<a href="postconf.5.html#local_recipient_maps">local_recipient_maps</a> specifies a list of
+ lookup tables that does not match the recipient.
+
+ Parameters concerning known/unknown recipients of relay destinations:
+
+ <b><a href="postconf.5.html#relay_domains">relay_domains</a> (Postfix</b> &gt;<b>= 3.0: empty, Postfix</b> &lt; <b>3.0: $<a href="postconf.5.html#mydestination">mydestination</a>)</b>
+ What destination domains (and subdomains thereof) this system
+ will relay mail to.
+
+ <b><a href="postconf.5.html#relay_recipient_maps">relay_recipient_maps</a> (empty)</b>
+ Optional lookup tables with all valid addresses in the domains
+ that match $<a href="postconf.5.html#relay_domains">relay_domains</a>.
+
+ <b><a href="postconf.5.html#unknown_relay_recipient_reject_code">unknown_relay_recipient_reject_code</a> (550)</b>
+ The numerical Postfix SMTP server reply code when a recipient
+ address matches $<a href="postconf.5.html#relay_domains">relay_domains</a>, and <a href="postconf.5.html#relay_recipient_maps">relay_recipient_maps</a> speci-
+ fies a list of lookup tables that does not match the recipient
+ address.
+
+ Parameters concerning known/unknown recipients in virtual alias
+ domains:
+
+ <b><a href="postconf.5.html#virtual_alias_domains">virtual_alias_domains</a> ($<a href="postconf.5.html#virtual_alias_maps">virtual_alias_maps</a>)</b>
+ Postfix is final destination for the specified list of virtual
+ alias domains, that is, domains for which all addresses are
+ aliased to addresses in other local or remote domains.
+
+ <b><a href="postconf.5.html#virtual_alias_maps">virtual_alias_maps</a> ($<a href="postconf.5.html#virtual_maps">virtual_maps</a>)</b>
+ Optional lookup tables that alias specific mail addresses or
+ domains to other local or remote address.
+
+ <b><a href="postconf.5.html#unknown_virtual_alias_reject_code">unknown_virtual_alias_reject_code</a> (550)</b>
+ The Postfix SMTP server reply code when a recipient address
+ matches $<a href="postconf.5.html#virtual_alias_domains">virtual_alias_domains</a>, and $<a href="postconf.5.html#virtual_alias_maps">virtual_alias_maps</a> speci-
+ fies a list of lookup tables that does not match the recipient
+ address.
+
+ Parameters concerning known/unknown recipients in virtual mailbox
+ domains:
+
+ <b><a href="postconf.5.html#virtual_mailbox_domains">virtual_mailbox_domains</a> ($<a href="postconf.5.html#virtual_mailbox_maps">virtual_mailbox_maps</a>)</b>
+ Postfix is final destination for the specified list of domains;
+ mail is delivered via the $<a href="postconf.5.html#virtual_transport">virtual_transport</a> mail delivery
+ transport.
+
+ <b><a href="postconf.5.html#virtual_mailbox_maps">virtual_mailbox_maps</a> (empty)</b>
+ Optional lookup tables with all valid addresses in the domains
+ that match $<a href="postconf.5.html#virtual_mailbox_domains">virtual_mailbox_domains</a>.
+
+ <b><a href="postconf.5.html#unknown_virtual_mailbox_reject_code">unknown_virtual_mailbox_reject_code</a> (550)</b>
+ The Postfix SMTP server reply code when a recipient address
+ matches $<a href="postconf.5.html#virtual_mailbox_domains">virtual_mailbox_domains</a>, and $<a href="postconf.5.html#virtual_mailbox_maps">virtual_mailbox_maps</a>
+ specifies a list of lookup tables that does not match the recip-
+ ient address.
+
+<b>RESOURCE AND RATE CONTROLS</b>
+ The following parameters limit resource usage by the SMTP server and/or
+ control client request rates.
+
+ <b><a href="postconf.5.html#line_length_limit">line_length_limit</a> (2048)</b>
+ Upon input, long lines are chopped up into pieces of at most
+ this length; upon delivery, long lines are reconstructed.
+
+ <b><a href="postconf.5.html#queue_minfree">queue_minfree</a> (0)</b>
+ The minimal amount of free space in bytes in the queue file sys-
+ tem that is needed to receive mail.
+
+ <b><a href="postconf.5.html#message_size_limit">message_size_limit</a> (10240000)</b>
+ The maximal size in bytes of a message, including envelope
+ information.
+
+ <b><a href="postconf.5.html#smtpd_recipient_limit">smtpd_recipient_limit</a> (1000)</b>
+ The maximal number of recipients that the Postfix SMTP server
+ accepts per message delivery request.
+
+ <b><a href="postconf.5.html#smtpd_timeout">smtpd_timeout</a> (normal: 300s, overload: 10s)</b>
+ The time limit for sending a Postfix SMTP server response and
+ for receiving a remote SMTP client request.
+
+ <b><a href="postconf.5.html#smtpd_history_flush_threshold">smtpd_history_flush_threshold</a> (100)</b>
+ The maximal number of lines in the Postfix SMTP server command
+ history before it is flushed upon receipt of EHLO, RSET, or end
+ of DATA.
+
+ Available in Postfix version 2.3 and later:
+
+ <b><a href="postconf.5.html#smtpd_peername_lookup">smtpd_peername_lookup</a> (yes)</b>
+ Attempt to look up the remote SMTP client hostname, and verify
+ that the name matches the client IP address.
+
+ The per SMTP client connection count and request rate limits are imple-
+ mented in co-operation with the <a href="anvil.8.html"><b>anvil</b>(8)</a> service, and are available in
+ Postfix version 2.2 and later.
+
+ <b><a href="postconf.5.html#smtpd_client_connection_count_limit">smtpd_client_connection_count_limit</a> (50)</b>
+ How many simultaneous connections any client is allowed to make
+ to this service.
+
+ <b><a href="postconf.5.html#smtpd_client_connection_rate_limit">smtpd_client_connection_rate_limit</a> (0)</b>
+ The maximal number of connection attempts any client is allowed
+ to make to this service per time unit.
+
+ <b><a href="postconf.5.html#smtpd_client_message_rate_limit">smtpd_client_message_rate_limit</a> (0)</b>
+ The maximal number of message delivery requests that any client
+ is allowed to make to this service per time unit, regardless of
+ whether or not Postfix actually accepts those messages.
+
+ <b><a href="postconf.5.html#smtpd_client_recipient_rate_limit">smtpd_client_recipient_rate_limit</a> (0)</b>
+ The maximal number of recipient addresses that any client is
+ allowed to send to this service per time unit, regardless of
+ whether or not Postfix actually accepts those recipients.
+
+ <b><a href="postconf.5.html#smtpd_client_event_limit_exceptions">smtpd_client_event_limit_exceptions</a> ($<a href="postconf.5.html#mynetworks">mynetworks</a>)</b>
+ Clients that are excluded from smtpd_client_*_count/rate_limit
+ restrictions.
+
+ Available in Postfix version 2.3 and later:
+
+ <b><a href="postconf.5.html#smtpd_client_new_tls_session_rate_limit">smtpd_client_new_tls_session_rate_limit</a> (0)</b>
+ The maximal number of new (i.e., uncached) TLS sessions that a
+ remote SMTP client is allowed to negotiate with this service per
+ time unit.
+
+ Available in Postfix version 2.9 and later:
+
+ <b><a href="postconf.5.html#smtpd_per_record_deadline">smtpd_per_record_deadline</a> (normal: no, overload: yes)</b>
+ Change the behavior of the <a href="postconf.5.html#smtpd_timeout">smtpd_timeout</a> and <a href="postconf.5.html#smtpd_starttls_timeout">smtpd_start</a>-
+ <a href="postconf.5.html#smtpd_starttls_timeout">tls_timeout</a> time limits, from a time limit per read or write
+ system call, to a time limit to send or receive a complete
+ record (an SMTP command line, SMTP response line, SMTP message
+ content line, or TLS protocol message).
+
+ Available in Postfix version 3.1 and later:
+
+ <b><a href="postconf.5.html#smtpd_client_auth_rate_limit">smtpd_client_auth_rate_limit</a> (0)</b>
+ The maximal number of AUTH commands that any client is allowed
+ to send to this service per time unit, regardless of whether or
+ not Postfix actually accepts those commands.
+
+<b>TARPIT CONTROLS</b>
+ When a remote SMTP client makes errors, the Postfix SMTP server can
+ insert delays before responding. This can help to slow down run-away
+ software. The behavior is controlled by an error counter that counts
+ the number of errors within an SMTP session that a client makes without
+ delivering mail.
+
+ <b><a href="postconf.5.html#smtpd_error_sleep_time">smtpd_error_sleep_time</a> (1s)</b>
+ With Postfix version 2.1 and later: the SMTP server response
+ delay after a client has made more than $<a href="postconf.5.html#smtpd_soft_error_limit">smtpd_soft_error_limit</a>
+ errors, and fewer than $<a href="postconf.5.html#smtpd_hard_error_limit">smtpd_hard_error_limit</a> errors, without
+ delivering mail.
+
+ <b><a href="postconf.5.html#smtpd_soft_error_limit">smtpd_soft_error_limit</a> (10)</b>
+ The number of errors a remote SMTP client is allowed to make
+ without delivering mail before the Postfix SMTP server slows
+ down all its responses.
+
+ <b><a href="postconf.5.html#smtpd_hard_error_limit">smtpd_hard_error_limit</a> (normal: 20, overload: 1)</b>
+ The maximal number of errors a remote SMTP client is allowed to
+ make without delivering mail.
+
+ <b><a href="postconf.5.html#smtpd_junk_command_limit">smtpd_junk_command_limit</a> (normal: 100, overload: 1)</b>
+ The number of junk commands (NOOP, VRFY, ETRN or RSET) that a
+ remote SMTP client can send before the Postfix SMTP server
+ starts to increment the error counter with each junk command.
+
+ Available in Postfix version 2.1 and later:
+
+ <b><a href="postconf.5.html#smtpd_recipient_overshoot_limit">smtpd_recipient_overshoot_limit</a> (1000)</b>
+ The number of recipients that a remote SMTP client can send in
+ excess of the limit specified with $<a href="postconf.5.html#smtpd_recipient_limit">smtpd_recipient_limit</a>,
+ before the Postfix SMTP server increments the per-session error
+ count for each excess recipient.
+
+<b>ACCESS POLICY DELEGATION CONTROLS</b>
+ As of version 2.1, Postfix can be configured to delegate access policy
+ decisions to an external server that runs outside Postfix. See the
+ file <a href="SMTPD_POLICY_README.html">SMTPD_POLICY_README</a> for more information.
+
+ <b><a href="postconf.5.html#smtpd_policy_service_max_idle">smtpd_policy_service_max_idle</a> (300s)</b>
+ The time after which an idle SMTPD policy service connection is
+ closed.
+
+ <b><a href="postconf.5.html#smtpd_policy_service_max_ttl">smtpd_policy_service_max_ttl</a> (1000s)</b>
+ The time after which an active SMTPD policy service connection
+ is closed.
+
+ <b><a href="postconf.5.html#smtpd_policy_service_timeout">smtpd_policy_service_timeout</a> (100s)</b>
+ The time limit for connecting to, writing to, or receiving from
+ a delegated SMTPD policy server.
+
+ Available in Postfix version 3.0 and later:
+
+ <b><a href="postconf.5.html#smtpd_policy_service_default_action">smtpd_policy_service_default_action</a> (451 4.3.5 Server configuration</b>
+ <b>problem)</b>
+ The default action when an SMTPD policy service request fails.
+
+ <b><a href="postconf.5.html#smtpd_policy_service_request_limit">smtpd_policy_service_request_limit</a> (0)</b>
+ The maximal number of requests per SMTPD policy service connec-
+ tion, or zero (no limit).
+
+ <b><a href="postconf.5.html#smtpd_policy_service_try_limit">smtpd_policy_service_try_limit</a> (2)</b>
+ The maximal number of attempts to send an SMTPD policy service
+ request before giving up.
+
+ <b><a href="postconf.5.html#smtpd_policy_service_retry_delay">smtpd_policy_service_retry_delay</a> (1s)</b>
+ The delay between attempts to resend a failed SMTPD policy ser-
+ vice request.
+
+ Available in Postfix version 3.1 and later:
+
+ <b><a href="postconf.5.html#smtpd_policy_service_policy_context">smtpd_policy_service_policy_context</a> (empty)</b>
+ Optional information that the Postfix SMTP server specifies in
+ the "policy_context" attribute of a policy service request
+ (originally, to share the same service endpoint among multiple
+ <a href="postconf.5.html#check_policy_service">check_policy_service</a> clients).
+
+<b>ACCESS CONTROLS</b>
+ The <a href="SMTPD_ACCESS_README.html">SMTPD_ACCESS_README</a> document gives an introduction to all the SMTP
+ server access control features.
+
+ <b><a href="postconf.5.html#smtpd_delay_reject">smtpd_delay_reject</a> (yes)</b>
+ Wait until the RCPT TO command before evaluating
+ $<a href="postconf.5.html#smtpd_client_restrictions">smtpd_client_restrictions</a>, $<a href="postconf.5.html#smtpd_helo_restrictions">smtpd_helo_restrictions</a> and
+ $<a href="postconf.5.html#smtpd_sender_restrictions">smtpd_sender_restrictions</a>, or wait until the ETRN command
+ before evaluating $<a href="postconf.5.html#smtpd_client_restrictions">smtpd_client_restrictions</a> and
+ $<a href="postconf.5.html#smtpd_helo_restrictions">smtpd_helo_restrictions</a>.
+
+ <b><a href="postconf.5.html#parent_domain_matches_subdomains">parent_domain_matches_subdomains</a> (see 'postconf -d' output)</b>
+ A list of Postfix features where the pattern "example.com" also
+ matches subdomains of example.com, instead of requiring an
+ explicit ".example.com" pattern.
+
+ <b><a href="postconf.5.html#smtpd_client_restrictions">smtpd_client_restrictions</a> (empty)</b>
+ Optional restrictions that the Postfix SMTP server applies in
+ the context of a client connection request.
+
+ <b><a href="postconf.5.html#smtpd_helo_required">smtpd_helo_required</a> (no)</b>
+ Require that a remote SMTP client introduces itself with the
+ HELO or EHLO command before sending the MAIL command or other
+ commands that require EHLO negotiation.
+
+ <b><a href="postconf.5.html#smtpd_helo_restrictions">smtpd_helo_restrictions</a> (empty)</b>
+ Optional restrictions that the Postfix SMTP server applies in
+ the context of a client HELO command.
+
+ <b><a href="postconf.5.html#smtpd_sender_restrictions">smtpd_sender_restrictions</a> (empty)</b>
+ Optional restrictions that the Postfix SMTP server applies in
+ the context of a client MAIL FROM command.
+
+ <b><a href="postconf.5.html#smtpd_recipient_restrictions">smtpd_recipient_restrictions</a> (see 'postconf -d' output)</b>
+ Optional restrictions that the Postfix SMTP server applies in
+ the context of a client RCPT TO command, after
+ <a href="postconf.5.html#smtpd_relay_restrictions">smtpd_relay_restrictions</a>.
+
+ <b><a href="postconf.5.html#smtpd_etrn_restrictions">smtpd_etrn_restrictions</a> (empty)</b>
+ Optional restrictions that the Postfix SMTP server applies in
+ the context of a client ETRN command.
+
+ <b><a href="postconf.5.html#allow_untrusted_routing">allow_untrusted_routing</a> (no)</b>
+ Forward mail with sender-specified routing
+ (user[@%!]remote[@%!]site) from untrusted clients to destina-
+ tions matching $<a href="postconf.5.html#relay_domains">relay_domains</a>.
+
+ <b><a href="postconf.5.html#smtpd_restriction_classes">smtpd_restriction_classes</a> (empty)</b>
+ User-defined aliases for groups of access restrictions.
+
+ <b><a href="postconf.5.html#smtpd_null_access_lookup_key">smtpd_null_access_lookup_key</a> (</b>&lt;&gt;<b>)</b>
+ The lookup key to be used in SMTP <a href="access.5.html"><b>access</b>(5)</a> tables instead of
+ the null sender address.
+
+ <b><a href="postconf.5.html#permit_mx_backup_networks">permit_mx_backup_networks</a> (empty)</b>
+ Restrict the use of the <a href="postconf.5.html#permit_mx_backup">permit_mx_backup</a> SMTP access feature to
+ only domains whose primary MX hosts match the listed networks.
+
+ Available in Postfix version 2.0 and later:
+
+ <b><a href="postconf.5.html#smtpd_data_restrictions">smtpd_data_restrictions</a> (empty)</b>
+ Optional access restrictions that the Postfix SMTP server
+ applies in the context of the SMTP DATA command.
+
+ <b><a href="postconf.5.html#smtpd_expansion_filter">smtpd_expansion_filter</a> (see 'postconf -d' output)</b>
+ What characters are allowed in $name expansions of RBL reply
+ templates.
+
+ Available in Postfix version 2.1 and later:
+
+ <b><a href="postconf.5.html#smtpd_reject_unlisted_sender">smtpd_reject_unlisted_sender</a> (no)</b>
+ Request that the Postfix SMTP server rejects mail from unknown
+ sender addresses, even when no explicit <a href="postconf.5.html#reject_unlisted_sender">reject_unlisted_sender</a>
+ access restriction is specified.
+
+ <b><a href="postconf.5.html#smtpd_reject_unlisted_recipient">smtpd_reject_unlisted_recipient</a> (yes)</b>
+ Request that the Postfix SMTP server rejects mail for unknown
+ recipient addresses, even when no explicit
+ <a href="postconf.5.html#reject_unlisted_recipient">reject_unlisted_recipient</a> access restriction is specified.
+
+ Available in Postfix version 2.2 and later:
+
+ <b><a href="postconf.5.html#smtpd_end_of_data_restrictions">smtpd_end_of_data_restrictions</a> (empty)</b>
+ Optional access restrictions that the Postfix SMTP server
+ applies in the context of the SMTP END-OF-DATA command.
+
+ Available in Postfix version 2.10 and later:
+
+ <b><a href="postconf.5.html#smtpd_relay_restrictions">smtpd_relay_restrictions</a> (<a href="postconf.5.html#permit_mynetworks">permit_mynetworks</a>, <a href="postconf.5.html#permit_sasl_authenticated">permit_sasl_authenticated</a>,</b>
+ <b><a href="postconf.5.html#defer_unauth_destination">defer_unauth_destination</a>)</b>
+ Access restrictions for mail relay control that the Postfix SMTP
+ server applies in the context of the RCPT TO command, before
+ <a href="postconf.5.html#smtpd_recipient_restrictions">smtpd_recipient_restrictions</a>.
+
+<b>SENDER AND RECIPIENT ADDRESS VERIFICATION CONTROLS</b>
+ Postfix version 2.1 introduces sender and recipient address verifica-
+ tion. This feature is implemented by sending probe email messages that
+ are not actually delivered. This feature is requested via the
+ <a href="postconf.5.html#reject_unverified_sender">reject_unverified_sender</a> and <a href="postconf.5.html#reject_unverified_recipient">reject_unverified_recipient</a> access
+ restrictions. The status of verification probes is maintained by the
+ <a href="verify.8.html"><b>verify</b>(8)</a> server. See the file <a href="ADDRESS_VERIFICATION_README.html">ADDRESS_VERIFICATION_README</a> for infor-
+ mation about how to configure and operate the Postfix sender/recipient
+ address verification service.
+
+ <b><a href="postconf.5.html#address_verify_poll_count">address_verify_poll_count</a> (normal: 3, overload: 1)</b>
+ How many times to query the <a href="verify.8.html"><b>verify</b>(8)</a> service for the completion
+ of an address verification request in progress.
+
+ <b><a href="postconf.5.html#address_verify_poll_delay">address_verify_poll_delay</a> (3s)</b>
+ The delay between queries for the completion of an address veri-
+ fication request in progress.
+
+ <b><a href="postconf.5.html#address_verify_sender">address_verify_sender</a> ($<a href="postconf.5.html#double_bounce_sender">double_bounce_sender</a>)</b>
+ The sender address to use in address verification probes; prior
+ to Postfix 2.5 the default was "postmaster".
+
+ <b><a href="postconf.5.html#unverified_sender_reject_code">unverified_sender_reject_code</a> (450)</b>
+ The numerical Postfix SMTP server response code when a recipient
+ address is rejected by the <a href="postconf.5.html#reject_unverified_sender">reject_unverified_sender</a> restriction.
+
+ <b><a href="postconf.5.html#unverified_recipient_reject_code">unverified_recipient_reject_code</a> (450)</b>
+ The numerical Postfix SMTP server response when a recipient
+ address is rejected by the <a href="postconf.5.html#reject_unverified_recipient">reject_unverified_recipient</a> restric-
+ tion.
+
+ Available in Postfix version 2.6 and later:
+
+ <b><a href="postconf.5.html#unverified_sender_defer_code">unverified_sender_defer_code</a> (450)</b>
+ The numerical Postfix SMTP server response code when a sender
+ address probe fails due to a temporary error condition.
+
+ <b><a href="postconf.5.html#unverified_recipient_defer_code">unverified_recipient_defer_code</a> (450)</b>
+ The numerical Postfix SMTP server response when a recipient
+ address probe fails due to a temporary error condition.
+
+ <b><a href="postconf.5.html#unverified_sender_reject_reason">unverified_sender_reject_reason</a> (empty)</b>
+ The Postfix SMTP server's reply when rejecting mail with
+ <a href="postconf.5.html#reject_unverified_sender">reject_unverified_sender</a>.
+
+ <b><a href="postconf.5.html#unverified_recipient_reject_reason">unverified_recipient_reject_reason</a> (empty)</b>
+ The Postfix SMTP server's reply when rejecting mail with
+ <a href="postconf.5.html#reject_unverified_recipient">reject_unverified_recipient</a>.
+
+ <b><a href="postconf.5.html#unverified_sender_tempfail_action">unverified_sender_tempfail_action</a> ($<a href="postconf.5.html#reject_tempfail_action">reject_tempfail_action</a>)</b>
+ The Postfix SMTP server's action when <a href="postconf.5.html#reject_unverified_sender">reject_unverified_sender</a>
+ fails due to a temporary error condition.
+
+ <b><a href="postconf.5.html#unverified_recipient_tempfail_action">unverified_recipient_tempfail_action</a> ($<a href="postconf.5.html#reject_tempfail_action">reject_tempfail_action</a>)</b>
+ The Postfix SMTP server's action when <a href="postconf.5.html#reject_unverified_recipient">reject_unverified_recipi</a>-
+ <a href="postconf.5.html#reject_unverified_recipient">ent</a> fails due to a temporary error condition.
+
+ Available with Postfix 2.9 and later:
+
+ <b><a href="postconf.5.html#address_verify_sender_ttl">address_verify_sender_ttl</a> (0s)</b>
+ The time between changes in the time-dependent portion of
+ address verification probe sender addresses.
+
+<b>ACCESS CONTROL RESPONSES</b>
+ The following parameters control numerical SMTP reply codes and/or text
+ responses.
+
+ <b><a href="postconf.5.html#access_map_reject_code">access_map_reject_code</a> (554)</b>
+ The numerical Postfix SMTP server response code for an <a href="access.5.html"><b>access</b>(5)</a>
+ map "reject" action.
+
+ <b><a href="postconf.5.html#defer_code">defer_code</a> (450)</b>
+ The numerical Postfix SMTP server response code when a remote
+ SMTP client request is rejected by the "defer" restriction.
+
+ <b><a href="postconf.5.html#invalid_hostname_reject_code">invalid_hostname_reject_code</a> (501)</b>
+ The numerical Postfix SMTP server response code when the client
+ HELO or EHLO command parameter is rejected by the
+ <a href="postconf.5.html#reject_invalid_helo_hostname">reject_invalid_helo_hostname</a> restriction.
+
+ <b><a href="postconf.5.html#maps_rbl_reject_code">maps_rbl_reject_code</a> (554)</b>
+ The numerical Postfix SMTP server response code when a remote
+ SMTP client request is blocked by the <a href="postconf.5.html#reject_rbl_client">reject_rbl_client</a>,
+ <a href="postconf.5.html#reject_rhsbl_client">reject_rhsbl_client</a>, <a href="postconf.5.html#reject_rhsbl_reverse_client">reject_rhsbl_reverse_client</a>,
+ <a href="postconf.5.html#reject_rhsbl_sender">reject_rhsbl_sender</a> or <a href="postconf.5.html#reject_rhsbl_recipient">reject_rhsbl_recipient</a> restriction.
+
+ <b><a href="postconf.5.html#non_fqdn_reject_code">non_fqdn_reject_code</a> (504)</b>
+ The numerical Postfix SMTP server reply code when a client
+ request is rejected by the <a href="postconf.5.html#reject_non_fqdn_helo_hostname">reject_non_fqdn_helo_hostname</a>,
+ <a href="postconf.5.html#reject_non_fqdn_sender">reject_non_fqdn_sender</a> or <a href="postconf.5.html#reject_non_fqdn_recipient">reject_non_fqdn_recipient</a> restriction.
+
+ <b><a href="postconf.5.html#plaintext_reject_code">plaintext_reject_code</a> (450)</b>
+ The numerical Postfix SMTP server response code when a request
+ is rejected by the <b><a href="postconf.5.html#reject_plaintext_session">reject_plaintext_session</a></b> restriction.
+
+ <b><a href="postconf.5.html#reject_code">reject_code</a> (554)</b>
+ The numerical Postfix SMTP server response code when a remote
+ SMTP client request is rejected by the "reject" restriction.
+
+ <b><a href="postconf.5.html#relay_domains_reject_code">relay_domains_reject_code</a> (554)</b>
+ The numerical Postfix SMTP server response code when a client
+ request is rejected by the <a href="postconf.5.html#reject_unauth_destination">reject_unauth_destination</a> recipient
+ restriction.
+
+ <b><a href="postconf.5.html#unknown_address_reject_code">unknown_address_reject_code</a> (450)</b>
+ The numerical response code when the Postfix SMTP server rejects
+ a sender or recipient address because its domain is unknown.
+
+ <b><a href="postconf.5.html#unknown_client_reject_code">unknown_client_reject_code</a> (450)</b>
+ The numerical Postfix SMTP server response code when a client
+ without valid address &lt;=&gt; name mapping is rejected by the
+ <a href="postconf.5.html#reject_unknown_client_hostname">reject_unknown_client_hostname</a> restriction.
+
+ <b><a href="postconf.5.html#unknown_hostname_reject_code">unknown_hostname_reject_code</a> (450)</b>
+ The numerical Postfix SMTP server response code when the host-
+ name specified with the HELO or EHLO command is rejected by the
+ <a href="postconf.5.html#reject_unknown_helo_hostname">reject_unknown_helo_hostname</a> restriction.
+
+ Available in Postfix version 2.0 and later:
+
+ <b><a href="postconf.5.html#default_rbl_reply">default_rbl_reply</a> (see 'postconf -d' output)</b>
+ The default Postfix SMTP server response template for a request
+ that is rejected by an RBL-based restriction.
+
+ <b><a href="postconf.5.html#multi_recipient_bounce_reject_code">multi_recipient_bounce_reject_code</a> (550)</b>
+ The numerical Postfix SMTP server response code when a remote
+ SMTP client request is blocked by the <a href="postconf.5.html#reject_multi_recipient_bounce">reject_multi_recipi</a>-
+ <a href="postconf.5.html#reject_multi_recipient_bounce">ent_bounce</a> restriction.
+
+ <b><a href="postconf.5.html#rbl_reply_maps">rbl_reply_maps</a> (empty)</b>
+ Optional lookup tables with RBL response templates.
+
+ Available in Postfix version 2.6 and later:
+
+ <b><a href="postconf.5.html#access_map_defer_code">access_map_defer_code</a> (450)</b>
+ The numerical Postfix SMTP server response code for an <a href="access.5.html"><b>access</b>(5)</a>
+ map "defer" action, including "<a href="postconf.5.html#defer_if_permit">defer_if_permit</a>" or
+ "<a href="postconf.5.html#defer_if_reject">defer_if_reject</a>".
+
+ <b><a href="postconf.5.html#reject_tempfail_action">reject_tempfail_action</a> (<a href="postconf.5.html#defer_if_permit">defer_if_permit</a>)</b>
+ The Postfix SMTP server's action when a reject-type restriction
+ fails due to a temporary error condition.
+
+ <b><a href="postconf.5.html#unknown_helo_hostname_tempfail_action">unknown_helo_hostname_tempfail_action</a> ($<a href="postconf.5.html#reject_tempfail_action">reject_tempfail_action</a>)</b>
+ The Postfix SMTP server's action when <a href="postconf.5.html#reject_unknown_helo_hostname">reject_unknown_helo_host</a>-
+ <a href="postconf.5.html#reject_unknown_helo_hostname">name</a> fails due to a temporary error condition.
+
+ <b><a href="postconf.5.html#unknown_address_tempfail_action">unknown_address_tempfail_action</a> ($<a href="postconf.5.html#reject_tempfail_action">reject_tempfail_action</a>)</b>
+ The Postfix SMTP server's action when
+ <a href="postconf.5.html#reject_unknown_sender_domain">reject_unknown_sender_domain</a> or <a href="postconf.5.html#reject_unknown_recipient_domain">reject_unknown_recipient_domain</a>
+ fail due to a temporary error condition.
+
+<b>MISCELLANEOUS CONTROLS</b>
+ <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#command_directory">command_directory</a> (see 'postconf -d' output)</b>
+ The location of all postfix administrative commands.
+
+ <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#mail_name">mail_name</a> (Postfix)</b>
+ The mail system name that is displayed in Received: headers, in
+ the SMTP greeting banner, and in bounced mail.
+
+ <b><a href="postconf.5.html#mail_owner">mail_owner</a> (postfix)</b>
+ The UNIX system account that owns the Postfix queue and most
+ Postfix daemon processes.
+
+ <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#myhostname">myhostname</a> (see 'postconf -d' output)</b>
+ The internet hostname of this mail system.
+
+ <b><a href="postconf.5.html#mynetworks">mynetworks</a> (see 'postconf -d' output)</b>
+ The list of "trusted" remote SMTP clients that have more privi-
+ leges than "strangers".
+
+ <b><a href="postconf.5.html#myorigin">myorigin</a> ($<a href="postconf.5.html#myhostname">myhostname</a>)</b>
+ The domain name that locally-posted mail appears to come from,
+ and that locally posted mail is delivered to.
+
+ <b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b>
+ The process ID of a Postfix command or daemon process.
+
+ <b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b>
+ The process name of a Postfix command or daemon process.
+
+ <b><a href="postconf.5.html#queue_directory">queue_directory</a> (see 'postconf -d' output)</b>
+ The location of the Postfix top-level queue directory.
+
+ <b><a href="postconf.5.html#recipient_delimiter">recipient_delimiter</a> (empty)</b>
+ The set of characters that can separate a user name from its
+ extension (example: user+foo), or a .forward file name from its
+ extension (example: .forward+foo).
+
+ <b><a href="postconf.5.html#smtpd_banner">smtpd_banner</a> ($<a href="postconf.5.html#myhostname">myhostname</a> ESMTP $<a href="postconf.5.html#mail_name">mail_name</a>)</b>
+ The text that follows the 220 status code in the SMTP greeting
+ banner.
+
+ <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 version 2.2 and later:
+
+ <b><a href="postconf.5.html#smtpd_forbidden_commands">smtpd_forbidden_commands</a> (CONNECT, GET, POST)</b>
+ List of commands that cause the Postfix SMTP server to immedi-
+ ately terminate the session with a 221 code.
+
+ Available in Postfix version 2.5 and later:
+
+ <b><a href="postconf.5.html#smtpd_client_port_logging">smtpd_client_port_logging</a> (no)</b>
+ Enable logging of the remote SMTP client port in addition to the
+ hostname and IP address.
+
+ 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.
+
+ Available in Postfix 3.4 and later:
+
+ <b><a href="postconf.5.html#smtpd_reject_footer_maps">smtpd_reject_footer_maps</a> (empty)</b>
+ Lookup tables, indexed by the complete Postfix SMTP server 4xx
+ or 5xx response, with reject footer templates.
+
+<b>SEE ALSO</b>
+ <a href="anvil.8.html">anvil(8)</a>, connection/rate limiting
+ <a href="cleanup.8.html">cleanup(8)</a>, message canonicalization
+ <a href="tlsmgr.8.html">tlsmgr(8)</a>, TLS session and PRNG management
+ <a href="trivial-rewrite.8.html">trivial-rewrite(8)</a>, address resolver
+ <a href="verify.8.html">verify(8)</a>, address verification service
+ <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>README FILES</b>
+ <a href="ADDRESS_CLASS_README.html">ADDRESS_CLASS_README</a>, blocking unknown hosted or relay recipients
+ <a href="ADDRESS_REWRITING_README.html">ADDRESS_REWRITING_README</a>, Postfix address manipulation
+ <a href="BDAT_README.html">BDAT_README</a>, Postfix CHUNKING support
+ <a href="FILTER_README.html">FILTER_README</a>, external after-queue content filter
+ <a href="LOCAL_RECIPIENT_README.html">LOCAL_RECIPIENT_README</a>, blocking unknown local recipients
+ <a href="MILTER_README.html">MILTER_README</a>, before-queue mail filter applications
+ <a href="SMTPD_ACCESS_README.html">SMTPD_ACCESS_README</a>, built-in access policies
+ <a href="SMTPD_POLICY_README.html">SMTPD_POLICY_README</a>, external policy server
+ <a href="SMTPD_PROXY_README.html">SMTPD_PROXY_README</a>, external before-queue content filter
+ <a href="SASL_README.html">SASL_README</a>, Postfix SASL howto
+ <a href="TLS_README.html">TLS_README</a>, Postfix STARTTLS howto
+ <a href="VERP_README.html">VERP_README</a>, Postfix XVERP extension
+ <a href="XCLIENT_README.html">XCLIENT_README</a>, Postfix XCLIENT extension
+ <a href="XFORWARD_README.html">XFORWARD_README</a>, Postfix XFORWARD extension
+
+<b>LICENSE</b>
+ The Secure Mailer license must be distributed with this software.
+
+<b>AUTHOR(S)</b>
+ 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
+
+ SASL support originally by:
+ Till Franke
+ SuSE Rhein/Main AG
+ 65760 Eschborn, Germany
+
+ TLS support originally by:
+ Lutz Jaenicke
+ BTU Cottbus
+ Allgemeine Elektrotechnik
+ Universitaetsplatz 3-4
+ D-03044 Cottbus, Germany
+
+ Revised TLS support by:
+ Victor Duchovni
+ Morgan Stanley
+
+ SMTPD(8)
+</pre> </body> </html>