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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> dae-
       mon, and is placed into the <a href="QSHAPE_README.html#incoming_queue"><b>incoming</b> queue</a> as  one  single
       queue  file.   For  this  mode  of  operation, the program
       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  con-
       nection  requests, and for parameters given to <b>HELO, ETRN,</b>
       <b>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> configuration 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/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)

<b>DIAGNOSTICS</b>
       Problems and transactions are logged to <b>syslogd</b>(8).

       Depending  on the setting of the <b><a href="postconf.5.html#notify_classes">notify_classes</a></b> parameter,
       the postmaster 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 inter-operability with remote  SMTP  clients
              that implement an obsolete version of the AUTH com-
              mand (<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  com-
              ments or phrases.

       Available in Postfix version 2.1 and later:

       <b><a href="postconf.5.html#resolve_null_domain">resolve_null_domain</a> (no)</b>
              Resolve an address that ends in the "@" null domain
              as if the local hostname were specified, instead of
              rejecting the address as invalid.

       <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  key-
              words  (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 (pipelin-
              ing, 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 ses-
              sion id, even when TLS session  caching  is  turned
              off (<a href="postconf.5.html#smtpd_tls_session_cache_database">smtpd_tls_session_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 scaling.

       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>  time
              limit, 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 mes-
              sage).

<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 filtering, 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_rewrite_domain</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 further 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  mes-
              sage 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 config-
       ured to send incoming mail to a real-time SMTP-based  con-
       tent filter BEFORE mail is queued.  This content filter is
       expected to  inject  mail  back  into  Postfix.   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 filter.

       <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  communicates  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">MILTER_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  pro-
              tocol  extensions  for  communication with a Milter
              application; prior to Postfix 2.6 the default  pro-
              tocol 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 fil-
              ter) applications.

       <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) appli-
              cations.

       <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)  application,  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 connec-
              tion.

       <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.

<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 filtering, 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 feature.

<b>SASL AUTHENTICATION CONTROLS</b>
       Postfix  SASL  support (<a href="http://tools.ietf.org/html/rfc4954">RFC 4954</a>) can be used to authenti-
       cate 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 inter-operability with remote  SMTP  clients
              that implement an obsolete version of the AUTH com-
              mand (<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 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_sender_login_maps">smtpd_sender_login_maps</a> (empty)</b>
              Optional  lookup  table  with  the SASL login names
              that own 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 Post-
              fix 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 configura-
              tion files,  currently  used  only  to  locate  the
              $<a href="postconf.5.html#smtpd_sasl_path">smtpd_sasl_path</a>.conf file.

<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 parameters <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_secu</a>-</b>
       <b><a href="postconf.5.html#smtpd_sasl_security_options">rity_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 intermediate 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  intermediate  CA certifi-
              cates.

       <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  ses-
              sion  id,  even  when TLS session caching is turned
              off (<a href="postconf.5.html#smtpd_tls_session_cache_database">smtpd_tls_session_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  authentica-
              tion over unencrypted connections.

       <b><a href="postconf.5.html#smtpd_tls_ccert_verifydepth">smtpd_tls_ccert_verifydepth</a> (9)</b>
              The  verification depth for remote SMTP client cer-
              tificates.

       <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 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 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 levels.

       <b><a href="postconf.5.html#smtpd_tls_mandatory_protocols">smtpd_tls_mandatory_protocols</a> (!SSLv2)</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  certifi-
              cate 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_session_cache_database">smtpd_tls_session_cache_database</a> (empty)</b>
              Name  of  the  file containing the optional Postfix
              SMTP server TLS session cache.

       <b><a href="postconf.5.html#smtpd_tls_session_cache_timeout">smtpd_tls_session_cache_timeout</a> (3600s)</b>
              The expiration time of Postfix SMTP server TLS ses-
              sion cache information.

       <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  com-
              mand.

       <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></b>
       <b>(ALL:!EXPORT:!LOW:!MEDIUM:+RC4:@STRENGTH)</b>
              The OpenSSL cipherlist for "HIGH" grade ciphers.

       <b><a href="postconf.5.html#tls_medium_cipherlist">tls_medium_cipherlist</a> (ALL:!EXPORT:!LOW:+RC4:@STRENGTH)</b>
              The OpenSSL cipherlist for "MEDIUM" or higher grade
              ciphers.

       <b><a href="postconf.5.html#tls_low_cipherlist">tls_low_cipherlist</a> (ALL:!EXPORT:+RC4:@STRENGTH)</b>
              The  OpenSSL  cipherlist  for "LOW" or higher grade
              ciphers.

       <b><a href="postconf.5.html#tls_export_cipherlist">tls_export_cipherlist</a> (ALL:+RC4:@STRENGTH)</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><a href="postconf.5.html#permit_tls_clientcerts">permit_tls_clientcerts</a></b>.

       Available in Postfix version 2.6 and later:

       <b><a href="postconf.5.html#smtpd_tls_protocols">smtpd_tls_protocols</a> (empty)</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> (export)</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 format.

       <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 format.

       <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 elliptic-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  preference  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.

<b>OBSOLETE STARTTLS CONTROLS</b>
       The following configuration parameters exist for  compati-
       bility 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>VERP SUPPORT CONTROLS</b>
       With  VERP  style  delivery,  each  recipient of a message
       receives a customized 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 configuration 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 command.

       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 command.

<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 pro-
       cesses 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 protocol 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 sub-
              ject  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.

<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  undeliverable  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.

       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>,  local-</b>
       <b>host)</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 sys-
              tem receives mail on.

       <b><a href="postconf.5.html#proxy_interfaces">proxy_interfaces</a> (empty)</b>
              The network interface addresses that this mail sys-
              tem 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</b>
       <b>$<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">mydestination</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> ($<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>  specifies  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">vir</a>-
              <a href="postconf.5.html#virtual_alias_maps">tual_alias_maps</a> specifies 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">vir</a>-
              <a href="postconf.5.html#virtual_transport">tual_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">vir</a>-
              <a href="postconf.5.html#virtual_mailbox_maps">tual_mailbox_maps</a> specifies a list of lookup tables
              that does not match the recipient 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 system 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 lim-
       its are implemented in co-operation with the <a href="anvil.8.html"><b>anvil</b>(8)</a> ser-
       vice, 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 ses-
              sions that a remote SMTP client is allowed to nego-
              tiate 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>  time
              limit, 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 mes-
              sage).

<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  con-
       trolled  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.

<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>,    $smtpd_helo_restric-
              tions 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 $smtpd_helo_restric-
              tions.

       <b><a href="postconf.5.html#parent_domain_matches_subdomains">parent_domain_matches_subdomains</a>  (see  'postconf -d' out-</b>
       <b>put)</b>
              What   Postfix   features   match   subdomains   of
              "domain.tld" automatically, instead of requiring an
              explicit ".domain.tld" pattern.

       <b><a href="postconf.5.html#smtpd_client_restrictions">smtpd_client_restrictions</a> (empty)</b>
              Optional Postfix SMTP server access restrictions in
              the context of  a  remote  SMTP  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 the SMTP 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 the MAIL FROM command.

       <b><a href="postconf.5.html#smtpd_recipient_restrictions">smtpd_recipient_restrictions</a>           (<a href="postconf.5.html#permit_mynetworks">permit_mynetworks</a>,</b>
       <b><a href="postconf.5.html#reject_unauth_destination">reject_unauth_destination</a>)</b>
              The  access  restrictions  that  the  Postfix  SMTP
              server  applies  in the context of the RCPT TO com-
              mand.

       <b><a href="postconf.5.html#smtpd_etrn_restrictions">smtpd_etrn_restrictions</a> (empty)</b>
              Optional SMTP server  access  restrictions  in  the
              context of a client ETRN request.

       <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 destinations 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 restric-
              tions.

       <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 com-
              mand.

       <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 restric-
              tion 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.

<b>SENDER AND RECIPIENT ADDRESS VERIFICATION CONTROLS</b>
       Postfix  version  2.1  introduces  sender  and   recipient
       address  verification.   This  feature  is  implemented by
       sending probe email messages that are not actually  deliv-
       ered.   This  feature  is requested via the reject_unveri-
       fied_sender   and    <a href="postconf.5.html#reject_unverified_recipient">reject_unverified_recipient</a>    access
       restrictions.   The status of verification probes is main-
       tained by the <a href="verify.8.html"><b>verify</b>(8)</a> server.  See the file <a href="ADDRESS_VERIFICATION_README.html">ADDRESS_VER</a>-
       <a href="ADDRESS_VERIFICATION_README.html">IFICATION_README</a>  for  information  about how to configure
       and operate the Postfix sender/recipient address verifica-
       tion 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 verification 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 "post-
              master".

       <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 reject_unveri-
              fied_recipient restriction.

       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 tempo-
              rary 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_temp</a>-</b>
       <b><a href="postconf.5.html#reject_tempfail_action">fail_action</a>)</b>
              The Postfix SMTP server's action when <a href="postconf.5.html#reject_unverified_sender">reject_unver</a>-
              <a href="postconf.5.html#reject_unverified_sender">ified_sender</a>  fails due to a temporary error condi-
              tion.

       <b><a href="postconf.5.html#unverified_recipient_tempfail_action">unverified_recipient_tempfail_action</a>        ($<a href="postconf.5.html#reject_tempfail_action">reject_temp</a>-</b>
       <b><a href="postconf.5.html#reject_tempfail_action">fail_action</a>)</b>
              The Postfix SMTP server's action when <a href="postconf.5.html#reject_unverified_recipient">reject_unver</a>-
              <a href="postconf.5.html#reject_unverified_recipient">ified_recipient</a> fails due to a temporary error con-
              dition.

       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 por-
              tion   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>reject_plain-</b>
              <b>text_session</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  Postfix  SMTP  server response code
              when a sender or recipient address is  rejected  by
              the         <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> restriction.

       <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 map-
              ping is rejected by the reject_unknown_client_host-
              name 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 hostname 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_recipient_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  condi-
              tion.

       <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_temp</a>-</b>
       <b><a href="postconf.5.html#reject_tempfail_action">fail_action</a>)</b>
              The    Postfix    SMTP    server's    action   when
              <a href="postconf.5.html#reject_unknown_helo_hostname">reject_unknown_helo_hostname</a> fails due to an tempo-
              rary 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 tem-
              porary 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> configuration 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 com-
              mands.

       <b><a href="postconf.5.html#double_bounce_sender">double_bounce_sender</a> (double-bounce)</b>
              The sender address of postmaster notifications that
              are generated 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  termi-
              nating 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 privileges 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 deliv-
              ered 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  direc-
              tory.

       <b><a href="postconf.5.html#recipient_delimiter">recipient_delimiter</a> (empty)</b>
              The separator between user names and address exten-
              sions (user+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>
              The  mail  system  name  that  is  prepended to the
              process name in syslog  records,  so  that  "smtpd"
              becomes, for example, "postfix/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 immediately 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.

<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
       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="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

       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)
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