SMTPD(8)                                                              SMTPD(8)

NAME
       smtpd - Postfix SMTP server

SYNOPSIS
       smtpd [generic Postfix daemon options]

       sendmail -bs

DESCRIPTION
       The  SMTP  server accepts network connection requests and performs zero
       or more SMTP transactions per connection.   Each  received  message  is
       piped  through  the  cleanup(8) daemon, and is placed into the incoming
       queue as one single queue file.  For this mode of operation,  the  pro-
       gram expects to be run from the master(8) process manager.

       Alternatively,  the SMTP server be can run in stand-alone mode; this is
       traditionally obtained with "sendmail -bs".  When the SMTP server  runs
       stand-alone  with  non  $mail_owner  privileges,  it receives mail even
       while the mail system is not running, deposits messages  directly  into
       the  maildrop 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 $mail_owner privileges.

       The  SMTP  server  implements  a  variety  of  policies  for connection
       requests, and for parameters given to HELO, ETRN, MAIL FROM,  VRFY  and
       RCPT TO commands. They are detailed below and in the main.cf configura-
       tion file.

SECURITY
       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.

STANDARDS
       RFC 821 (SMTP protocol)
       RFC 1123 (Host requirements)
       RFC 1652 (8bit-MIME transport)
       RFC 1869 (SMTP service extensions)
       RFC 1870 (Message size declaration)
       RFC 1985 (ETRN command)
       RFC 2034 (SMTP enhanced status codes)
       RFC 2554 (AUTH command)
       RFC 2821 (SMTP protocol)
       RFC 2920 (SMTP pipelining)
       RFC 3030 (CHUNKING without BINARYMIME)
       RFC 3207 (STARTTLS command)
       RFC 3461 (SMTP DSN extension)
       RFC 3463 (Enhanced status codes)
       RFC 3848 (ESMTP transmission types)
       RFC 4409 (Message submission)
       RFC 4954 (AUTH command)
       RFC 5321 (SMTP protocol)
       RFC 6531 (Internationalized SMTP)
       RFC 6533 (Internationalized Delivery Status Notifications)
       RFC 7505 ("Null MX" No Service Resource Record)

DIAGNOSTICS
       Problems and transactions are logged to syslogd(8) or postlogd(8).

       Depending on the setting of the notify_classes parameter, the  postmas-
       ter  is  notified of bounces, protocol problems, policy violations, and
       of other trouble.

CONFIGURATION PARAMETERS
       Changes to main.cf are picked up automatically, as  smtpd(8)  processes
       run for only a limited amount of time. Use the command "postfix reload"
       to speed up a change.

       The text below provides only a parameter summary. See  postconf(5)  for
       more details including examples.

COMPATIBILITY CONTROLS
       The  following  parameters  work  around implementation errors in other
       software, and/or allow you to override standards in  order  to  prevent
       undesirable use.

       broken_sasl_auth_clients (no)
              Enable  interoperability with remote SMTP clients that implement
              an obsolete version of the AUTH command (RFC 4954).

       disable_vrfy_command (no)
              Disable the SMTP VRFY command.

       smtpd_noop_commands (empty)
              List of commands that the Postfix SMTP server  replies  to  with
              "250  Ok",  without doing any syntax checks and without changing
              state.

       strict_rfc821_envelopes (no)
              Require that addresses received in SMTP MAIL FROM  and  RCPT  TO
              commands  are  enclosed with <>, and that those addresses do not
              contain RFC 822 style comments or phrases.

       Available in Postfix version 2.1 and later:

       smtpd_reject_unlisted_sender (no)
              Request that the Postfix SMTP server rejects mail  from  unknown
              sender  addresses,  even when no explicit reject_unlisted_sender
              access restriction is specified.

       smtpd_sasl_exceptions_networks (empty)
              What remote SMTP clients the Postfix SMTP server will not  offer
              AUTH support to.

       Available in Postfix version 2.2 and later:

       smtpd_discard_ehlo_keyword_address_maps (empty)
              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.

       smtpd_discard_ehlo_keywords (empty)
              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.

       smtpd_delay_open_until_valid_rcpt (yes)
              Postpone the start of an SMTP mail  transaction  until  a  valid
              RCPT TO command is received.

       Available in Postfix version 2.3 and later:

       smtpd_tls_always_issue_session_ids (yes)
              Force  the  Postfix  SMTP server to issue a TLS session id, even
              when  TLS  session  caching  is   turned   off   (smtpd_tls_ses-
              sion_cache_database is empty).

       Available in Postfix version 2.6 and later:

       tcp_windowsize (0)
              An  optional  workaround for routers that break TCP window scal-
              ing.

       Available in Postfix version 2.7 and later:

       smtpd_command_filter (empty)
              A mechanism to transform commands from remote SMTP clients.

       Available in Postfix version 2.9 and later:

       smtpd_per_record_deadline (normal: no, overload: yes)
              Change  the  behavior  of  the  smtpd_timeout  and  smtpd_start-
              tls_timeout  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:

       smtpd_dns_reply_filter (empty)
              Optional filter for Postfix SMTP server DNS lookup results.

ADDRESS REWRITING CONTROLS
       See the ADDRESS_REWRITING_README document for a detailed discussion  of
       Postfix address rewriting.

       receive_override_options (empty)
              Enable or disable recipient validation, built-in content filter-
              ing, or address mapping.

       Available in Postfix version 2.2 and later:

       local_header_rewrite_clients (permit_inet_interfaces)
              Rewrite message header addresses in mail from these clients  and
              update incomplete addresses with the domain name in $myorigin or
              $mydomain; 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  remote_header_re-
              write_domain parameter.

BEFORE-SMTPD PROXY AGENT
       Available in Postfix version 2.10 and later:

       smtpd_upstream_proxy_protocol (empty)
              The  name of the proxy protocol used by an optional before-smtpd
              proxy agent.

       smtpd_upstream_proxy_timeout (5s)
              The time  limit  for  the  proxy  protocol  specified  with  the
              smtpd_upstream_proxy_protocol parameter.

AFTER QUEUE EXTERNAL CONTENT INSPECTION CONTROLS
       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 FILTER_README document for details.

       content_filter (empty)
              After the message is queued, send  the  entire  message  to  the
              specified transport:destination.

BEFORE QUEUE EXTERNAL CONTENT INSPECTION CONTROLS
       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 SMTPD_PROXY_README document for details on how to config-
       ure and operate this feature.

       smtpd_proxy_filter (empty)
              The hostname and TCP port of the mail filtering proxy server.

       smtpd_proxy_ehlo ($myhostname)
              How  the  Postfix SMTP server announces itself to the proxy fil-
              ter.

       smtpd_proxy_options (empty)
              List of options that control how the Postfix SMTP server  commu-
              nicates with a before-queue content filter.

       smtpd_proxy_timeout (100s)
              The  time limit for connecting to a proxy filter and for sending
              or receiving information.

BEFORE QUEUE MILTER CONTROLS
       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 MIL-
       TER_README document.

       smtpd_milters (empty)
              A list of Milter (mail filter) applications for  new  mail  that
              arrives via the Postfix smtpd(8) server.

       milter_protocol (6)
              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.

       milter_default_action (tempfail)
              The  default  action  when a Milter (mail filter) application is
              unavailable or mis-configured.

       milter_macro_daemon_name ($myhostname)
              The {daemon_name} macro value for Milter (mail filter)  applica-
              tions.

       milter_macro_v ($mail_name $mail_version)
              The {v} macro value for Milter (mail filter) applications.

       milter_connect_timeout (30s)
              The time limit for connecting to a Milter (mail filter) applica-
              tion, and for negotiating protocol options.

       milter_command_timeout (30s)
              The time limit for sending an SMTP command  to  a  Milter  (mail
              filter) application, and for receiving the response.

       milter_content_timeout (300s)
              The  time  limit  for  sending message content to a Milter (mail
              filter) application, and for receiving the response.

       milter_connect_macros (see 'postconf -d' output)
              The macros that are sent to Milter  (mail  filter)  applications
              after completion of an SMTP connection.

       milter_helo_macros (see 'postconf -d' output)
              The  macros  that  are sent to Milter (mail filter) applications
              after the SMTP HELO or EHLO command.

       milter_mail_macros (see 'postconf -d' output)
              The macros that are sent to Milter  (mail  filter)  applications
              after the SMTP MAIL FROM command.

       milter_rcpt_macros (see 'postconf -d' output)
              The  macros  that  are sent to Milter (mail filter) applications
              after the SMTP RCPT TO command.

       milter_data_macros (see 'postconf -d' output)
              The macros that are sent to version 4  or  higher  Milter  (mail
              filter) applications after the SMTP DATA command.

       milter_unknown_command_macros (see 'postconf -d' output)
              The  macros  that  are  sent to version 3 or higher Milter (mail
              filter) applications after an unknown SMTP command.

       milter_end_of_header_macros (see 'postconf -d' output)
              The macros that are sent to Milter  (mail  filter)  applications
              after the end of the message header.

       milter_end_of_data_macros (see 'postconf -d' output)
              The  macros  that  are sent to Milter (mail filter) applications
              after the message end-of-data.

       Available in Postfix version 3.1 and later:

       milter_macro_defaults (empty)
              Optional list of name=value pairs that  specify  default  values
              for  arbitrary  macros  that Postfix may send to Milter applica-
              tions.

       Available in Postfix version 3.2 and later:

       smtpd_milter_maps (empty)
              Lookup tables with Milter settings per  remote  SMTP  client  IP
              address.

GENERAL CONTENT INSPECTION CONTROLS
       The  following parameters are applicable for both built-in and external
       content filters.

       Available in Postfix version 2.1 and later:

       receive_override_options (empty)
              Enable or disable recipient validation, built-in content filter-
              ing, or address mapping.

EXTERNAL CONTENT INSPECTION CONTROLS
       The  following  parameters  are  applicable  for  both before-queue and
       after-queue content filtering.

       Available in Postfix version 2.1 and later:

       smtpd_authorized_xforward_hosts (empty)
              What remote SMTP clients are allowed to use  the  XFORWARD  fea-
              ture.

SASL AUTHENTICATION CONTROLS
       Postfix SASL support (RFC 4954) 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 SASL_README document for
       details.

       broken_sasl_auth_clients (no)
              Enable interoperability with remote SMTP clients that  implement
              an obsolete version of the AUTH command (RFC 4954).

       smtpd_sasl_auth_enable (no)
              Enable SASL authentication in the Postfix SMTP server.

       smtpd_sasl_local_domain (empty)
              The  name of the Postfix SMTP server's local SASL authentication
              realm.

       smtpd_sasl_security_options (noanonymous)
              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 smtpd_sasl_type.

       smtpd_sender_login_maps (empty)
              Optional lookup table with the SASL login  names  that  own  the
              sender (MAIL FROM) addresses.

       Available in Postfix version 2.1 and later:

       smtpd_sasl_exceptions_networks (empty)
              What  remote SMTP clients the Postfix SMTP server will not offer
              AUTH support to.

       Available in Postfix version 2.1 and 2.2:

       smtpd_sasl_application_name (smtpd)
              The application name that the Postfix SMTP server uses for  SASL
              server initialization.

       Available in Postfix version 2.3 and later:

       smtpd_sasl_authenticated_header (no)
              Report the SASL authenticated user name in the smtpd(8) Received
              message header.

       smtpd_sasl_path (smtpd)
              Implementation-specific information that the Postfix SMTP server
              passes  through  to  the  SASL  plug-in  implementation  that is
              selected with smtpd_sasl_type.

       smtpd_sasl_type (cyrus)
              The SASL plug-in type that the Postfix SMTP  server  should  use
              for authentication.

       Available in Postfix version 2.5 and later:

       cyrus_sasl_config_path (empty)
              Search path for Cyrus SASL application configuration files, cur-
              rently used only to locate the $smtpd_sasl_path.conf file.

       Available in Postfix version 2.11 and later:

       smtpd_sasl_service (smtp)
              The service name that is passed to  the  SASL  plug-in  that  is
              selected with smtpd_sasl_type and smtpd_sasl_path.

       Available in Postfix version 3.4 and later:

       smtpd_sasl_response_limit (12288)
              The maximum length of a SASL client's response to a server chal-
              lenge.

STARTTLS SUPPORT CONTROLS
       Detailed information about STARTTLS configuration may be found  in  the
       TLS_README document.

       smtpd_tls_security_level (empty)
              The  SMTP TLS security level for the Postfix SMTP server; when a
              non-empty value is specified, this overrides the obsolete param-
              eters smtpd_use_tls and smtpd_enforce_tls.

       smtpd_sasl_tls_security_options ($smtpd_sasl_security_options)
              The  SASL  authentication security options that the Postfix SMTP
              server uses for TLS encrypted SMTP sessions.

       smtpd_starttls_timeout (see 'postconf -d' output)
              The time limit for Postfix SMTP server write and read operations
              during TLS startup and shutdown handshake procedures.

       smtpd_tls_CAfile (empty)
              A  file  containing  (PEM  format)  CA  certificates of root CAs
              trusted to sign either remote SMTP client certificates or inter-
              mediate CA certificates.

       smtpd_tls_CApath (empty)
              A  directory containing (PEM format) CA certificates of root CAs
              trusted to sign either remote SMTP client certificates or inter-
              mediate CA certificates.

       smtpd_tls_always_issue_session_ids (yes)
              Force  the  Postfix  SMTP server to issue a TLS session id, even
              when  TLS  session  caching  is   turned   off   (smtpd_tls_ses-
              sion_cache_database is empty).

       smtpd_tls_ask_ccert (no)
              Ask a remote SMTP client for a client certificate.

       smtpd_tls_auth_only (no)
              When  TLS  encryption is optional in the Postfix SMTP server, do
              not announce or accept SASL authentication over unencrypted con-
              nections.

       smtpd_tls_ccert_verifydepth (9)
              The verification depth for remote SMTP client certificates.

       smtpd_tls_cert_file (empty)
              File with the Postfix SMTP server RSA certificate in PEM format.

       smtpd_tls_exclude_ciphers (empty)
              List of ciphers or cipher types to exclude from the SMTP  server
              cipher list at all TLS security levels.

       smtpd_tls_dcert_file (empty)
              File with the Postfix SMTP server DSA certificate in PEM format.

       smtpd_tls_dh1024_param_file (empty)
              File with DH parameters that the Postfix SMTP server should  use
              with non-export EDH ciphers.

       smtpd_tls_dh512_param_file (empty)
              File  with DH parameters that the Postfix SMTP server should use
              with export-grade EDH ciphers.

       smtpd_tls_dkey_file ($smtpd_tls_dcert_file)
              File with the Postfix SMTP server DSA private key in PEM format.

       smtpd_tls_key_file ($smtpd_tls_cert_file)
              File with the Postfix SMTP server RSA private key in PEM format.

       smtpd_tls_loglevel (0)
              Enable additional Postfix SMTP server logging of TLS activity.

       smtpd_tls_mandatory_ciphers (medium)
              The minimum TLS cipher grade that the Postfix SMTP  server  will
              use with mandatory TLS encryption.

       smtpd_tls_mandatory_exclude_ciphers (empty)
              Additional  list  of ciphers or cipher types to exclude from the
              Postfix SMTP server cipher list at mandatory TLS  security  lev-
              els.

       smtpd_tls_mandatory_protocols (!SSLv2, !SSLv3)
              The  SSL/TLS  protocols accepted by the Postfix SMTP server with
              mandatory TLS encryption.

       smtpd_tls_received_header (no)
              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.

       smtpd_tls_req_ccert (no)
              With  mandatory  TLS  encryption,  require a trusted remote SMTP
              client certificate in order to allow TLS connections to proceed.

       smtpd_tls_wrappermode (no)
              Run  the Postfix SMTP server in the non-standard "wrapper" mode,
              instead of using the STARTTLS command.

       tls_daemon_random_bytes (32)
              The number of pseudo-random bytes that an  smtp(8)  or  smtpd(8)
              process  requests from the tlsmgr(8) server in order to seed its
              internal pseudo random number generator (PRNG).

       tls_high_cipherlist (see 'postconf -d' output)
              The OpenSSL cipherlist for "high" grade ciphers.

       tls_medium_cipherlist (see 'postconf -d' output)
              The OpenSSL cipherlist for "medium" or higher grade ciphers.

       tls_low_cipherlist (see 'postconf -d' output)
              The OpenSSL cipherlist for "low" or higher grade ciphers.

       tls_export_cipherlist (see 'postconf -d' output)
              The OpenSSL cipherlist for "export" or higher grade ciphers.

       tls_null_cipherlist (eNULL:!aNULL)
              The OpenSSL cipherlist for "NULL"  grade  ciphers  that  provide
              authentication without encryption.

       Available in Postfix version 2.5 and later:

       smtpd_tls_fingerprint_digest (md5)
              The   message   digest   algorithm   to  construct  remote  SMTP
              client-certificate  fingerprints  or  public  key   fingerprints
              (Postfix   2.9   and  later)  for  check_ccert_access  and  per-
              mit_tls_clientcerts.

       Available in Postfix version 2.6 and later:

       smtpd_tls_protocols (!SSLv2, !SSLv3)
              List of TLS protocols that the Postfix SMTP server will  exclude
              or include with opportunistic TLS encryption.

       smtpd_tls_ciphers (medium)
              The  minimum  TLS cipher grade that the Postfix SMTP server will
              use with opportunistic TLS encryption.

       smtpd_tls_eccert_file (empty)
              File with the Postfix SMTP server ECDSA certificate in PEM  for-
              mat.

       smtpd_tls_eckey_file ($smtpd_tls_eccert_file)
              File  with the Postfix SMTP server ECDSA private key in PEM for-
              mat.

       smtpd_tls_eecdh_grade (see 'postconf -d' output)
              The Postfix SMTP server  security  grade  for  ephemeral  ellip-
              tic-curve Diffie-Hellman (EECDH) key exchange.

       tls_eecdh_strong_curve (prime256v1)
              The  elliptic curve used by the Postfix SMTP server for sensibly
              strong ephemeral ECDH key exchange.

       tls_eecdh_ultra_curve (secp384r1)
              The elliptic curve used by the Postfix SMTP server for maximally
              strong ephemeral ECDH key exchange.

       Available in Postfix version 2.8 and later:

       tls_preempt_cipherlist (no)
              With SSLv3 and later, use the Postfix SMTP server's cipher pref-
              erence order instead of the remote  client's  cipher  preference
              order.

       tls_disable_workarounds (see 'postconf -d' output)
              List or bit-mask of OpenSSL bug work-arounds to disable.

       Available in Postfix version 2.11 and later:

       tlsmgr_service_name (tlsmgr)
              The name of the tlsmgr(8) service entry in master.cf.

       Available in Postfix version 3.0 and later:

       tls_session_ticket_cipher  (Postfix >= 3.0: aes-256-cbc, Postfix < 3.0:
       aes-128-cbc)
              Algorithm used to encrypt RFC5077 TLS session tickets.

       Available in Postfix version 3.2 and later:

       tls_eecdh_auto_curves (see 'postconf -d' output)
              The prioritized list of elliptic curves supported by the Postfix
              SMTP client and server.

       Available in Postfix version 3.4 and later:

       smtpd_tls_chain_files (empty)
              List of one or more PEM files, each holding one or more  private
              keys directly followed by a corresponding certificate chain.

       tls_server_sni_maps (empty)
              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:

       tls_fast_shutdown_enable (yes)
              A workaround for implementations that hang Postfix while shuting
              down a TLS session, until Postfix times out.

OBSOLETE STARTTLS CONTROLS
       The  following  configuration  parameters  exist for compatibility with
       Postfix versions before 2.3. Support for these will  be  removed  in  a
       future release.

       smtpd_use_tls (no)
              Opportunistic  TLS:  announce  STARTTLS  support  to remote SMTP
              clients, but do not require that clients use TLS encryption.

       smtpd_enforce_tls (no)
              Mandatory TLS: announce STARTTLS support to remote SMTP clients,
              and require that clients use TLS encryption.

       smtpd_tls_cipherlist (empty)
              Obsolete  Postfix  < 2.3 control for the Postfix SMTP server TLS
              cipher list.

SMTPUTF8 CONTROLS
       Preliminary SMTPUTF8 support is introduced with Postfix 3.0.

       smtputf8_enable (yes)
              Enable preliminary SMTPUTF8 support for the protocols  described
              in RFC 6531..6533.

       strict_smtputf8 (no)
              Enable stricter enforcement of the SMTPUTF8 protocol.

       smtputf8_autodetect_classes (sendmail, verify)
              Detect  that  a message requires SMTPUTF8 support for the speci-
              fied mail origin classes.

       Available in Postfix version 3.2 and later:

       enable_idna2003_compatibility (no)
              Enable  'transitional'  compatibility   between   IDNA2003   and
              IDNA2008,  when  converting UTF-8 domain names to/from the ASCII
              form that is used for DNS lookups.

VERP SUPPORT CONTROLS
       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 VERP_README 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.

       default_verp_delimiters (+=)
              The two default VERP delimiter characters.

       verp_delimiter_filter (-=+)
              The characters Postfix accepts as VERP delimiter  characters  on
              the Postfix sendmail(1) command line and in SMTP commands.

       Available in Postfix version 1.1 and 2.0:

       authorized_verp_clients ($mynetworks)
              What  remote  SMTP clients are allowed to specify the XVERP com-
              mand.

       Available in Postfix version 2.1 and later:

       smtpd_authorized_verp_clients ($authorized_verp_clients)
              What remote SMTP clients are allowed to specify the  XVERP  com-
              mand.

TROUBLE SHOOTING CONTROLS
       The  DEBUG_README  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.

       debug_peer_level (2)
              The increment in verbose logging level when a remote  client  or
              server matches a pattern in the debug_peer_list parameter.

       debug_peer_list (empty)
              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 $debug_peer_level.

       error_notice_recipient (postmaster)
              The  recipient  of  postmaster notifications about mail delivery
              problems that are caused by policy, resource, software or proto-
              col errors.

       internal_mail_filter_classes (empty)
              What   categories  of  Postfix-generated  mail  are  subject  to
              before-queue   content    inspection    by    non_smtpd_milters,
              header_checks and body_checks.

       notify_classes (resource, software)
              The list of error classes that are reported to the postmaster.

       smtpd_reject_footer (empty)
              Optional  information  that  is appended after each Postfix SMTP
              server 4XX or 5XX response.

       soft_bounce (no)
              Safety net to keep mail queued that would otherwise be  returned
              to the sender.

       Available in Postfix version 2.1 and later:

       smtpd_authorized_xclient_hosts (empty)
              What remote SMTP clients are allowed to use the XCLIENT feature.

       Available in Postfix version 2.10 and later:

       smtpd_log_access_permit_actions (empty)
              Enable logging of the named  "permit"  actions  in  SMTP  server
              access  lists (by default, the SMTP server logs "reject" actions
              but not "permit" actions).

KNOWN VERSUS UNKNOWN RECIPIENT CONTROLS
       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 LOCAL_RECIPIENT_README and ADDRESS_CLASS_README documents.

       show_user_unknown_table_name (yes)
              Display  the  name  of the recipient table in the "User unknown"
              responses.

       canonical_maps (empty)
              Optional address mapping lookup tables for message  headers  and
              envelopes.

       recipient_canonical_maps (empty)
              Optional  address  mapping lookup tables for envelope and header
              recipient addresses.

       sender_canonical_maps (empty)
              Optional address mapping lookup tables for envelope  and  header
              sender addresses.

       Parameters concerning known/unknown local recipients:

       mydestination ($myhostname, localhost.$mydomain, localhost)
              The  list of domains that are delivered via the $local_transport
              mail delivery transport.

       inet_interfaces (all)
              The network interface addresses that this mail  system  receives
              mail on.

       proxy_interfaces (empty)
              The  network  interface addresses that this mail system receives
              mail on by way of a proxy or network address translation unit.

       inet_protocols (all)
              The Internet protocols Postfix will attempt to use  when  making
              or accepting connections.

       local_recipient_maps (proxy:unix:passwd.byname $alias_maps)
              Lookup tables with all names or addresses of local recipients: a
              recipient address is local when its domain  matches  $mydestina-
              tion, $inet_interfaces or $proxy_interfaces.

       unknown_local_recipient_reject_code (550)
              The numerical Postfix SMTP server response code when a recipient
              address is local, and $local_recipient_maps specifies a list  of
              lookup tables that does not match the recipient.

       Parameters concerning known/unknown recipients of relay destinations:

       relay_domains (Postfix >= 3.0: empty, Postfix < 3.0: $mydestination)
              What  destination  domains  (and subdomains thereof) this system
              will relay mail to.

       relay_recipient_maps (empty)
              Optional lookup tables with all valid addresses in  the  domains
              that match $relay_domains.

       unknown_relay_recipient_reject_code (550)
              The  numerical  Postfix  SMTP server reply code when a recipient
              address matches $relay_domains, and relay_recipient_maps  speci-
              fies  a  list of lookup tables that does not match the recipient
              address.

       Parameters  concerning  known/unknown  recipients  in   virtual   alias
       domains:

       virtual_alias_domains ($virtual_alias_maps)
              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.

       virtual_alias_maps ($virtual_maps)
              Optional  lookup  tables  that  alias specific mail addresses or
              domains to other local or remote address.

       unknown_virtual_alias_reject_code (550)
              The Postfix SMTP server reply  code  when  a  recipient  address
              matches  $virtual_alias_domains,  and $virtual_alias_maps speci-
              fies a list of lookup tables that does not match  the  recipient
              address.

       Parameters  concerning  known/unknown  recipients  in  virtual  mailbox
       domains:

       virtual_mailbox_domains ($virtual_mailbox_maps)
              Postfix is final destination for the specified list of  domains;
              mail  is  delivered  via  the  $virtual_transport  mail delivery
              transport.

       virtual_mailbox_maps (empty)
              Optional lookup tables with all valid addresses in  the  domains
              that match $virtual_mailbox_domains.

       unknown_virtual_mailbox_reject_code (550)
              The  Postfix  SMTP  server  reply  code when a recipient address
              matches  $virtual_mailbox_domains,   and   $virtual_mailbox_maps
              specifies a list of lookup tables that does not match the recip-
              ient address.

RESOURCE AND RATE CONTROLS
       The following parameters limit resource usage by the SMTP server and/or
       control client request rates.

       line_length_limit (2048)
              Upon  input,  long  lines  are chopped up into pieces of at most
              this length; upon delivery, long lines are reconstructed.

       queue_minfree (0)
              The minimal amount of free space in bytes in the queue file sys-
              tem that is needed to receive mail.

       message_size_limit (10240000)
              The  maximal  size  in  bytes  of  a message, including envelope
              information.

       smtpd_recipient_limit (1000)
              The maximal number of recipients that the  Postfix  SMTP  server
              accepts per message delivery request.

       smtpd_timeout (normal: 300s, overload: 10s)
              The  time  limit  for sending a Postfix SMTP server response and
              for receiving a remote SMTP client request.

       smtpd_history_flush_threshold (100)
              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:

       smtpd_peername_lookup (yes)
              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 anvil(8) service, and are available  in
       Postfix version 2.2 and later.

       smtpd_client_connection_count_limit (50)
              How  many simultaneous connections any client is allowed to make
              to this service.

       smtpd_client_connection_rate_limit (0)
              The maximal number of connection attempts any client is  allowed
              to make to this service per time unit.

       smtpd_client_message_rate_limit (0)
              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.

       smtpd_client_recipient_rate_limit (0)
              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.

       smtpd_client_event_limit_exceptions ($mynetworks)
              Clients  that  are excluded from smtpd_client_*_count/rate_limit
              restrictions.

       Available in Postfix version 2.3 and later:

       smtpd_client_new_tls_session_rate_limit (0)
              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:

       smtpd_per_record_deadline (normal: no, overload: yes)
              Change  the  behavior  of  the  smtpd_timeout  and  smtpd_start-
              tls_timeout  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:

       smtpd_client_auth_rate_limit (0)
              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.

TARPIT CONTROLS
       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.

       smtpd_error_sleep_time (1s)
              With Postfix version 2.1 and later:  the  SMTP  server  response
              delay  after a client has made more than $smtpd_soft_error_limit
              errors, and fewer than $smtpd_hard_error_limit  errors,  without
              delivering mail.

       smtpd_soft_error_limit (10)
              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.

       smtpd_hard_error_limit (normal: 20, overload: 1)
              The  maximal number of errors a remote SMTP client is allowed to
              make without delivering mail.

       smtpd_junk_command_limit (normal: 100, overload: 1)
              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:

       smtpd_recipient_overshoot_limit (1000)
              The number of recipients that a remote SMTP client can  send  in
              excess  of  the  limit  specified  with  $smtpd_recipient_limit,
              before the Postfix SMTP server increments the per-session  error
              count for each excess recipient.

ACCESS POLICY DELEGATION CONTROLS
       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 SMTPD_POLICY_README for more information.

       smtpd_policy_service_max_idle (300s)
              The  time after which an idle SMTPD policy service connection is
              closed.

       smtpd_policy_service_max_ttl (1000s)
              The time after which an active SMTPD policy  service  connection
              is closed.

       smtpd_policy_service_timeout (100s)
              The  time limit for connecting to, writing to, or receiving from
              a delegated SMTPD policy server.

       Available in Postfix version 3.0 and later:

       smtpd_policy_service_default_action  (451  4.3.5  Server  configuration
       problem)
              The default action when an SMTPD policy service request fails.

       smtpd_policy_service_request_limit (0)
              The maximal number of requests per SMTPD policy service  connec-
              tion, or zero (no limit).

       smtpd_policy_service_try_limit (2)
              The  maximal  number of attempts to send an SMTPD policy service
              request before giving up.

       smtpd_policy_service_retry_delay (1s)
              The delay between attempts to resend a failed SMTPD policy  ser-
              vice request.

       Available in Postfix version 3.1 and later:

       smtpd_policy_service_policy_context (empty)
              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
              check_policy_service clients).

ACCESS CONTROLS
       The SMTPD_ACCESS_README document gives an introduction to all the  SMTP
       server access control features.

       smtpd_delay_reject (yes)
              Wait    until    the   RCPT   TO   command   before   evaluating
              $smtpd_client_restrictions,     $smtpd_helo_restrictions     and
              $smtpd_sender_restrictions,  or  wait  until  the  ETRN  command
              before      evaluating      $smtpd_client_restrictions       and
              $smtpd_helo_restrictions.

       parent_domain_matches_subdomains (see 'postconf -d' output)
              A  list of Postfix features where the pattern "example.com" also
              matches subdomains  of  example.com,  instead  of  requiring  an
              explicit ".example.com" pattern.

       smtpd_client_restrictions (empty)
              Optional  restrictions  that  the Postfix SMTP server applies in
              the context of a client connection request.

       smtpd_helo_required (no)
              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.

       smtpd_helo_restrictions (empty)
              Optional restrictions that the Postfix SMTP  server  applies  in
              the context of a client HELO command.

       smtpd_sender_restrictions (empty)
              Optional  restrictions  that  the Postfix SMTP server applies in
              the context of a client MAIL FROM command.

       smtpd_recipient_restrictions (see 'postconf -d' output)
              Optional restrictions that the Postfix SMTP  server  applies  in
              the    context    of   a   client   RCPT   TO   command,   after
              smtpd_relay_restrictions.

       smtpd_etrn_restrictions (empty)
              Optional restrictions that the Postfix SMTP  server  applies  in
              the context of a client ETRN command.

       allow_untrusted_routing (no)
              Forward       mail       with      sender-specified      routing
              (user[@%!]remote[@%!]site) from untrusted  clients  to  destina-
              tions matching $relay_domains.

       smtpd_restriction_classes (empty)
              User-defined aliases for groups of access restrictions.

       smtpd_null_access_lookup_key (<>)
              The  lookup  key  to be used in SMTP access(5) tables instead of
              the null sender address.

       permit_mx_backup_networks (empty)
              Restrict the use of the permit_mx_backup SMTP access feature  to
              only domains whose primary MX hosts match the listed networks.

       Available in Postfix version 2.0 and later:

       smtpd_data_restrictions (empty)
              Optional  access  restrictions  that  the  Postfix  SMTP  server
              applies in the context of the SMTP DATA command.

       smtpd_expansion_filter (see 'postconf -d' output)
              What characters are allowed in $name  expansions  of  RBL  reply
              templates.

       Available in Postfix version 2.1 and later:

       smtpd_reject_unlisted_sender (no)
              Request  that  the Postfix SMTP server rejects mail from unknown
              sender addresses, even when no  explicit  reject_unlisted_sender
              access restriction is specified.

       smtpd_reject_unlisted_recipient (yes)
              Request  that  the  Postfix SMTP server rejects mail for unknown
              recipient     addresses,     even     when      no      explicit
              reject_unlisted_recipient access restriction is specified.

       Available in Postfix version 2.2 and later:

       smtpd_end_of_data_restrictions (empty)
              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:

       smtpd_relay_restrictions (permit_mynetworks, permit_sasl_authenticated,
       defer_unauth_destination)
              Access restrictions for mail relay control that the Postfix SMTP
              server  applies  in  the  context of the RCPT TO command, before
              smtpd_recipient_restrictions.

SENDER AND RECIPIENT ADDRESS VERIFICATION CONTROLS
       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
       reject_unverified_sender    and    reject_unverified_recipient   access
       restrictions.  The status of verification probes is maintained  by  the
       verify(8)  server.  See the file ADDRESS_VERIFICATION_README for infor-
       mation about how to configure and operate the Postfix  sender/recipient
       address verification service.

       address_verify_poll_count (normal: 3, overload: 1)
              How many times to query the verify(8) service for the completion
              of an address verification request in progress.

       address_verify_poll_delay (3s)
              The delay between queries for the completion of an address veri-
              fication request in progress.

       address_verify_sender ($double_bounce_sender)
              The  sender address to use in address verification probes; prior
              to Postfix 2.5 the default was "postmaster".

       unverified_sender_reject_code (450)
              The numerical Postfix SMTP server response code when a recipient
              address is rejected by the reject_unverified_sender restriction.

       unverified_recipient_reject_code (450)
              The numerical Postfix SMTP  server  response  when  a  recipient
              address  is rejected by the reject_unverified_recipient restric-
              tion.

       Available in Postfix version 2.6 and later:

       unverified_sender_defer_code (450)
              The numerical Postfix SMTP server response code  when  a  sender
              address probe fails due to a temporary error condition.

       unverified_recipient_defer_code (450)
              The  numerical  Postfix  SMTP  server  response when a recipient
              address probe fails due to a temporary error condition.

       unverified_sender_reject_reason (empty)
              The  Postfix  SMTP  server's  reply  when  rejecting  mail  with
              reject_unverified_sender.

       unverified_recipient_reject_reason (empty)
              The  Postfix  SMTP  server's  reply  when  rejecting  mail  with
              reject_unverified_recipient.

       unverified_sender_tempfail_action ($reject_tempfail_action)
              The Postfix SMTP server's action  when  reject_unverified_sender
              fails due to a temporary error condition.

       unverified_recipient_tempfail_action ($reject_tempfail_action)
              The  Postfix SMTP server's action when reject_unverified_recipi-
              ent fails due to a temporary error condition.

       Available with Postfix 2.9 and later:

       address_verify_sender_ttl (0s)
              The time  between  changes  in  the  time-dependent  portion  of
              address verification probe sender addresses.

ACCESS CONTROL RESPONSES
       The following parameters control numerical SMTP reply codes and/or text
       responses.

       access_map_reject_code (554)
              The numerical Postfix SMTP server response code for an access(5)
              map "reject" action.

       defer_code (450)
              The  numerical  Postfix  SMTP server response code when a remote
              SMTP client request is rejected by the "defer" restriction.

       invalid_hostname_reject_code (501)
              The numerical Postfix SMTP server response code when the  client
              HELO   or   EHLO   command   parameter   is   rejected   by  the
              reject_invalid_helo_hostname restriction.

       maps_rbl_reject_code (554)
              The numerical Postfix SMTP server response code  when  a  remote
              SMTP   client  request  is  blocked  by  the  reject_rbl_client,
              reject_rhsbl_client,                reject_rhsbl_reverse_client,
              reject_rhsbl_sender or reject_rhsbl_recipient restriction.

       non_fqdn_reject_code (504)
              The  numerical  Postfix  SMTP  server  reply  code when a client
              request  is  rejected  by   the   reject_non_fqdn_helo_hostname,
              reject_non_fqdn_sender or reject_non_fqdn_recipient restriction.

       plaintext_reject_code (450)
              The numerical Postfix SMTP server response code when  a  request
              is rejected by the reject_plaintext_session restriction.

       reject_code (554)
              The  numerical  Postfix  SMTP server response code when a remote
              SMTP client request is rejected by the "reject" restriction.

       relay_domains_reject_code (554)
              The numerical Postfix SMTP server response code  when  a  client
              request  is  rejected by the reject_unauth_destination recipient
              restriction.

       unknown_address_reject_code (450)
              The numerical response code when the Postfix SMTP server rejects
              a sender or recipient address because its domain is unknown.

       unknown_client_reject_code (450)
              The  numerical  Postfix  SMTP server response code when a client
              without valid address  <=>  name  mapping  is  rejected  by  the
              reject_unknown_client_hostname restriction.

       unknown_hostname_reject_code (450)
              The  numerical  Postfix SMTP server response code when the host-
              name specified with the HELO or EHLO command is rejected by  the
              reject_unknown_helo_hostname restriction.

       Available in Postfix version 2.0 and later:

       default_rbl_reply (see 'postconf -d' output)
              The  default Postfix SMTP server response template for a request
              that is rejected by an RBL-based restriction.

       multi_recipient_bounce_reject_code (550)
              The numerical Postfix SMTP server response code  when  a  remote
              SMTP  client  request  is  blocked  by  the reject_multi_recipi-
              ent_bounce restriction.

       rbl_reply_maps (empty)
              Optional lookup tables with RBL response templates.

       Available in Postfix version 2.6 and later:

       access_map_defer_code (450)
              The numerical Postfix SMTP server response code for an access(5)
              map    "defer"    action,    including    "defer_if_permit"   or
              "defer_if_reject".

       reject_tempfail_action (defer_if_permit)
              The Postfix SMTP server's action when a reject-type  restriction
              fails due to a temporary error condition.

       unknown_helo_hostname_tempfail_action ($reject_tempfail_action)
              The  Postfix SMTP server's action when reject_unknown_helo_host-
              name fails due to a temporary error condition.

       unknown_address_tempfail_action ($reject_tempfail_action)
              The      Postfix      SMTP      server's       action       when
              reject_unknown_sender_domain  or reject_unknown_recipient_domain
              fail due to a temporary error condition.

MISCELLANEOUS CONTROLS
       config_directory (see 'postconf -d' output)
              The default location of the Postfix main.cf and  master.cf  con-
              figuration files.

       daemon_timeout (18000s)
              How  much  time  a  Postfix  daemon process may take to handle a
              request before it is terminated by a built-in watchdog timer.

       command_directory (see 'postconf -d' output)
              The location of all postfix administrative commands.

       double_bounce_sender (double-bounce)
              The sender address of postmaster notifications that  are  gener-
              ated by the mail system.

       ipc_timeout (3600s)
              The  time  limit  for  sending  or receiving information over an
              internal communication channel.

       mail_name (Postfix)
              The mail system name that is displayed in Received: headers,  in
              the SMTP greeting banner, and in bounced mail.

       mail_owner (postfix)
              The  UNIX  system  account  that owns the Postfix queue and most
              Postfix daemon processes.

       max_idle (100s)
              The maximum amount of time that an idle Postfix  daemon  process
              waits for an incoming connection before terminating voluntarily.

       max_use (100)
              The maximal number of incoming connections that a Postfix daemon
              process will service before terminating voluntarily.

       myhostname (see 'postconf -d' output)
              The internet hostname of this mail system.

       mynetworks (see 'postconf -d' output)
              The  list of "trusted" remote SMTP clients that have more privi-
              leges than "strangers".

       myorigin ($myhostname)
              The domain name that locally-posted mail appears to  come  from,
              and that locally posted mail is delivered to.

       process_id (read-only)
              The process ID of a Postfix command or daemon process.

       process_name (read-only)
              The process name of a Postfix command or daemon process.

       queue_directory (see 'postconf -d' output)
              The location of the Postfix top-level queue directory.

       recipient_delimiter (empty)
              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).

       smtpd_banner ($myhostname ESMTP $mail_name)
              The  text  that follows the 220 status code in the SMTP greeting
              banner.

       syslog_facility (mail)
              The syslog facility of Postfix logging.

       syslog_name (see 'postconf -d' output)
              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:

       smtpd_forbidden_commands (CONNECT, GET, POST)
              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:

       smtpd_client_port_logging (no)
              Enable logging of the remote SMTP client port in addition to the
              hostname and IP address.

       Available in Postfix 3.3 and later:

       service_name (read-only)
              The master.cf service name of a Postfix daemon process.

       Available in Postfix 3.4 and later:

       smtpd_reject_footer_maps (empty)
              Lookup  tables,  indexed by the complete Postfix SMTP server 4xx
              or 5xx response, with reject footer templates.

SEE ALSO
       anvil(8), connection/rate limiting
       cleanup(8), message canonicalization
       tlsmgr(8), TLS session and PRNG management
       trivial-rewrite(8), address resolver
       verify(8), address verification service
       postconf(5), configuration parameters
       master(5), generic daemon options
       master(8), process manager
       postlogd(8), Postfix logging
       syslogd(8), system logging

README FILES
       ADDRESS_CLASS_README, blocking unknown hosted or relay recipients
       ADDRESS_REWRITING_README, Postfix address manipulation
       BDAT_README, Postfix CHUNKING support
       FILTER_README, external after-queue content filter
       LOCAL_RECIPIENT_README, blocking unknown local recipients
       MILTER_README, before-queue mail filter applications
       SMTPD_ACCESS_README, built-in access policies
       SMTPD_POLICY_README, external policy server
       SMTPD_PROXY_README, external before-queue content filter
       SASL_README, Postfix SASL howto
       TLS_README, Postfix STARTTLS howto
       VERP_README, Postfix XVERP extension
       XCLIENT_README, Postfix XCLIENT extension
       XFORWARD_README, Postfix XFORWARD extension

LICENSE
       The Secure Mailer license must be distributed with this software.

AUTHOR(S)
       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)