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NetBSD 6.1.5 - man page for smtp (netbsd section 8)

SMTP(8) 										  SMTP(8)

NAME
       smtp - Postfix SMTP+LMTP client

SYNOPSIS
       smtp [generic Postfix daemon options]

DESCRIPTION
       The Postfix SMTP+LMTP client implements the SMTP and LMTP mail delivery protocols. It pro-
       cesses message delivery requests from the queue manager. Each request  specifies  a  queue
       file,  a  sender address, a domain or host to deliver to, and recipient information.  This
       program expects to be run from the master(8) process manager.

       The SMTP+LMTP client updates the queue file  and  marks	recipients  as	finished,  or  it
       informs	the  queue  manager that delivery should be tried again at a later time. Delivery
       status reports are sent to the bounce(8), defer(8) or trace(8) daemon as appropriate.

       The SMTP+LMTP client looks up a list of mail exchanger addresses for the destination host,
       sorts  the list by preference, and connects to each listed address until it finds a server
       that responds.

       When a server is not reachable, or when mail delivery fails due	to  a  recoverable  error
       condition, the SMTP+LMTP client will try to deliver the mail to an alternate host.

       After a successful mail transaction, a connection may be saved to the scache(8) connection
       cache server, so that it may be used by any SMTP+LMTP client for a subsequent transaction.

       By default, connection caching is enabled temporarily for destinations that  have  a  high
       volume of mail in the active queue. Connection caching can be enabled permanently for spe-
       cific destinations.

SMTP DESTINATION SYNTAX
       SMTP destinations have the following form:

       domainname

       domainname:port
	      Look up the mail exchangers for the specified domain, and connect to the	specified
	      port (default: smtp).

       [hostname]

       [hostname]:port
	      Look  up	the  address(es) of the specified host, and connect to the specified port
	      (default: smtp).

       [address]

       [address]:port
	      Connect to the host at the specified address, and connect  to  the  specified  port
	      (default: smtp). An IPv6 address must be formatted as [ipv6:address].

LMTP DESTINATION SYNTAX
       LMTP destinations have the following form:

       unix:pathname
	      Connect to the local UNIX-domain server that is bound to the specified pathname. If
	      the process runs chrooted, an absolute pathname  is  interpreted	relative  to  the
	      Postfix queue directory.

       inet:hostname

       inet:hostname:port

       inet:[address]

       inet:[address]:port
	      Connect to the specified TCP port on the specified local or remote host. If no port
	      is specified, connect to the port defined as lmtp in services(4).  If no such  ser-
	      vice is found, the lmtp_tcp_port configuration parameter (default value of 24) will
	      be used.	An IPv6 address must be formatted as [ipv6:address].

SECURITY
       The SMTP+LMTP client is moderately security-sensitive. It talks to SMTP	or  LMTP  servers
       and  to	DNS servers on the network. The SMTP+LMTP client can be run chrooted at fixed low
       privilege.

STANDARDS
       RFC 821 (SMTP protocol)
       RFC 822 (ARPA Internet Text Messages)
       RFC 1651 (SMTP service extensions)
       RFC 1652 (8bit-MIME transport)
       RFC 1870 (Message Size Declaration)
       RFC 2033 (LMTP protocol)
       RFC 2034 (SMTP Enhanced Error Codes)
       RFC 2045 (MIME: Format of Internet Message Bodies)
       RFC 2046 (MIME: Media Types)
       RFC 2554 (AUTH command)
       RFC 2821 (SMTP protocol)
       RFC 2920 (SMTP Pipelining)
       RFC 3207 (STARTTLS command)
       RFC 3461 (SMTP DSN Extension)
       RFC 3463 (Enhanced Status Codes)
       RFC 4954 (AUTH command)

DIAGNOSTICS
       Problems and transactions are logged to syslogd(8).  Corrupted message files are marked so
       that the queue manager can move them to the corrupt queue for further inspection.

       Depending  on  the  setting of the notify_classes parameter, the postmaster is notified of
       bounces, protocol problems, and of other trouble.

BUGS
       SMTP and LMTP connection caching does not work with TLS. The  necessary	support  for  TLS
       object  passivation  and  re-activation	does not exist without closing the session, which
       defeats the purpose.

       SMTP and LMTP connection caching assumes that SASL credentials are valid for all  destina-
       tions that map onto the same IP address and TCP port.

CONFIGURATION PARAMETERS
       Before  Postfix	version 2.3, the LMTP client is a separate program that implements only a
       subset of the functionality available with SMTP: there is no support for TLS, and  connec-
       tions  are  cached  in-process, making it ineffective when the client is used for multiple
       domains.

       Most smtp_xxx configuration parameters have an lmtp_xxx "mirror" parameter for the equiva-
       lent  LMTP feature. This document describes only those LMTP-related parameters that aren't
       simply "mirror" parameters.

       Changes to main.cf are picked up automatically, as smtp(8) processes run for only  a  lim-
       ited 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 includ-
       ing examples.

COMPATIBILITY CONTROLS
       ignore_mx_lookup_error (no)
	      Ignore DNS MX lookups that produce no response.

       smtp_always_send_ehlo (yes)
	      Always send EHLO at the start of an SMTP session.

       smtp_never_send_ehlo (no)
	      Never send EHLO at the start of an SMTP session.

       smtp_defer_if_no_mx_address_found (no)
	      Defer mail delivery when no MX record resolves to an IP address.

       smtp_line_length_limit (990)
	      The maximal length of message header and body lines  that  Postfix  will	send  via
	      SMTP.

       smtp_pix_workaround_delay_time (10s)
	      How long the Postfix SMTP client pauses before sending ".<CR><LF>" in order to work
	      around the PIX firewall "<CR><LF>.<CR><LF>" bug.

       smtp_pix_workaround_threshold_time (500s)
	      How long a message must be queued before the Postfix SMTP client turns on  the  PIX
	      firewall	"<CR><LF>.<CR><LF>"  bug  workaround  for delivery through firewalls with
	      "smtp fixup" mode turned on.

       smtp_pix_workarounds (disable_esmtp, delay_dotcrlf)
	      A list that specifies zero or more workarounds for CISCO PIX firewall bugs.

       smtp_pix_workaround_maps (empty)
	      Lookup tables, indexed by the remote  SMTP  server  address,  with  per-destination
	      workarounds for CISCO PIX firewall bugs.

       smtp_quote_rfc821_envelope (yes)
	      Quote addresses in SMTP MAIL FROM and RCPT TO commands as required by RFC 2821.

       smtp_reply_filter (empty)
	      A mechanism to transform replies from remote SMTP servers one line at a time.

       smtp_skip_5xx_greeting (yes)
	      Skip  SMTP  servers  that  greet	with a 5XX status code (go away, do not try again
	      later).

       smtp_skip_quit_response (yes)
	      Do not wait for the response to the SMTP QUIT command.

       Available in Postfix version 2.0 and earlier:

       smtp_skip_4xx_greeting (yes)
	      Skip SMTP servers that greet with a 4XX status code (go away, try again later).

       Available in Postfix version 2.2 and later:

       smtp_discard_ehlo_keyword_address_maps (empty)
	      Lookup tables, indexed by the remote SMTP server	address,  with	case  insensitive
	      lists  of  EHLO  keywords  (pipelining, starttls, auth, etc.) that the Postfix SMTP
	      client will ignore in the EHLO response from a remote SMTP server.

       smtp_discard_ehlo_keywords (empty)
	      A case insensitive list of EHLO keywords (pipelining, starttls,  auth,  etc.)  that
	      the Postfix SMTP client will ignore in the EHLO response from a remote SMTP server.

       smtp_generic_maps (empty)
	      Optional lookup tables that perform address rewriting in the SMTP client, typically
	      to transform a locally valid address into a globally  valid  address  when  sending
	      mail across the Internet.

       Available in Postfix version 2.2.9 and later:

       smtp_cname_overrides_servername (version dependent)
	      Allow  DNS  CNAME  records  to override the servername that the Postfix SMTP client
	      uses for logging, SASL password lookup, TLS policy decisions,  or  TLS  certificate
	      verification.

       Available in Postfix version 2.3 and later:

       lmtp_discard_lhlo_keyword_address_maps (empty)
	      Lookup  tables,  indexed	by  the remote LMTP server address, with case insensitive
	      lists of LHLO keywords (pipelining, starttls, auth, etc.) that the LMTP client will
	      ignore in the LHLO response from a remote LMTP server.

       lmtp_discard_lhlo_keywords (empty)
	      A  case  insensitive  list of LHLO keywords (pipelining, starttls, auth, etc.) that
	      the LMTP client will ignore in the LHLO response from a remote LMTP server.

       Available in Postfix version 2.4.4 and later:

       send_cyrus_sasl_authzid (no)
	      When authenticating to a remote SMTP or LMTP server with the default setting  "no",
	      send  no	SASL  authoriZation  ID  (authzid);  send only the SASL authentiCation ID
	      (authcid) plus the authcid's password.

       Available in Postfix version 2.5 and later:

       smtp_header_checks (empty)
	      Restricted header_checks(5) tables for the Postfix SMTP client.

       smtp_mime_header_checks (empty)
	      Restricted mime_header_checks(5) tables for the Postfix SMTP client.

       smtp_nested_header_checks (empty)
	      Restricted nested_header_checks(5) tables for the Postfix SMTP client.

       smtp_body_checks (empty)
	      Restricted body_checks(5) tables for the Postfix SMTP client.

       Available in Postfix version 2.6 and later:

       tcp_windowsize (0)
	      An optional workaround for routers that break TCP window scaling.

       Available in Postfix version 2.8 and later:

       smtp_dns_resolver_options (empty)
	      DNS Resolver options for the Postfix SMTP client.

MIME PROCESSING CONTROLS
       Available in Postfix version 2.0 and later:

       disable_mime_output_conversion (no)
	      Disable the conversion of 8BITMIME format to 7BIT format.

       mime_boundary_length_limit (2048)
	      The maximal length of MIME multipart boundary strings.

       mime_nesting_limit (100)
	      The maximal recursion level that the MIME processor will handle.

EXTERNAL CONTENT INSPECTION CONTROLS
       Available in Postfix version 2.1 and later:

       smtp_send_xforward_command (no)
	      Send the non-standard XFORWARD command when the Postfix SMTP server  EHLO  response
	      announces XFORWARD support.

SASL AUTHENTICATION CONTROLS
       smtp_sasl_auth_enable (no)
	      Enable SASL authentication in the Postfix SMTP client.

       smtp_sasl_password_maps (empty)
	      Optional	SMTP  client  lookup  tables  with one username:password entry per remote
	      hostname or domain, or  sender  address  when  sender-dependent  authentication  is
	      enabled.

       smtp_sasl_security_options (noplaintext, noanonymous)
	      Postfix  SMTP client SASL security options; as of Postfix 2.3 the list of available
	      features	depends  on  the  SASL	client	implementation	that  is  selected   with
	      smtp_sasl_type.

       Available in Postfix version 2.2 and later:

       smtp_sasl_mechanism_filter (empty)
	      If  non-empty,  a  Postfix  SMTP client filter for the remote SMTP server's list of
	      offered SASL mechanisms.

       Available in Postfix version 2.3 and later:

       smtp_sender_dependent_authentication (no)
	      Enable sender-dependent authentication in the Postfix SMTP client; this  is  avail-
	      able  only with SASL authentication, and disables SMTP connection caching to ensure
	      that mail from different senders will use the appropriate credentials.

       smtp_sasl_path (empty)
	      Implementation-specific information that the Postfix SMTP client passes through  to
	      the SASL plug-in implementation that is selected with smtp_sasl_type.

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

       Available in Postfix version 2.5 and later:

       smtp_sasl_auth_cache_name (empty)
	      An  optional  table  to prevent repeated SASL authentication failures with the same
	      remote SMTP server hostname, username and password.

       smtp_sasl_auth_cache_time (90d)
	      The maximal age of an smtp_sasl_auth_cache_name entry before it is removed.

       smtp_sasl_auth_soft_bounce (yes)
	      When a remote SMTP server rejects a SASL authentication request with  a  535  reply
	      code, defer mail delivery instead of returning mail as undeliverable.

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

       smtp_tls_security_level (empty)
	      The  default  SMTP TLS security level for the Postfix SMTP client; when a non-empty
	      value  is  specified,  this  overrides  the   obsolete   parameters   smtp_use_tls,
	      smtp_enforce_tls, and smtp_tls_enforce_peername.

       smtp_sasl_tls_security_options ($smtp_sasl_security_options)
	      The  SASL authentication security options that the Postfix SMTP client uses for TLS
	      encrypted SMTP sessions.

       smtp_starttls_timeout (300s)
	      Time limit for Postfix SMTP client write and read operations during TLS startup and
	      shutdown handshake procedures.

       smtp_tls_CAfile (empty)
	      A  file  containing  CA certificates of root CAs trusted to sign either remote SMTP
	      server certificates or intermediate CA certificates.

       smtp_tls_CApath (empty)
	      Directory with PEM format certificate authority certificates that the Postfix  SMTP
	      client uses to verify a remote SMTP server certificate.

       smtp_tls_cert_file (empty)
	      File with the Postfix SMTP client RSA certificate in PEM format.

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

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

       smtp_tls_mandatory_exclude_ciphers (empty)
	      Additional  list	of ciphers or cipher types to exclude from the SMTP client cipher
	      list at mandatory TLS security levels.

       smtp_tls_dcert_file (empty)
	      File with the Postfix SMTP client DSA certificate in PEM format.

       smtp_tls_dkey_file ($smtp_tls_dcert_file)
	      File with the Postfix SMTP client DSA private key in PEM format.

       smtp_tls_key_file ($smtp_tls_cert_file)
	      File with the Postfix SMTP client RSA private key in PEM format.

       smtp_tls_loglevel (0)
	      Enable additional Postfix SMTP client logging of TLS activity.

       smtp_tls_note_starttls_offer (no)
	      Log the hostname of a remote SMTP server that offers  STARTTLS,  when  TLS  is  not
	      already enabled for that server.

       smtp_tls_policy_maps (empty)
	      Optional lookup tables with the Postfix SMTP client TLS security policy by next-hop
	      destination; when a non-empty value  is  specified,  this  overrides  the  obsolete
	      smtp_tls_per_site parameter.

       smtp_tls_mandatory_protocols (!SSLv2)
	      List  of SSL/TLS protocols that the Postfix SMTP client will use with mandatory TLS
	      encryption.

       smtp_tls_scert_verifydepth (9)
	      The verification depth for remote SMTP server certificates.

       smtp_tls_secure_cert_match (nexthop, dot-nexthop)
	      The server certificate peername verification method for the "secure"  TLS  security
	      level.

       smtp_tls_session_cache_database (empty)
	      Name of the file containing the optional Postfix SMTP client TLS session cache.

       smtp_tls_session_cache_timeout (3600s)
	      The expiration time of Postfix SMTP client TLS session cache information.

       smtp_tls_verify_cert_match (hostname)
	      The  server  certificate peername verification method for the "verify" TLS security
	      level.

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

       tls_medium_cipherlist (ALL:!EXPORT:!LOW:+RC4:@STRENGTH)
	      The OpenSSL cipherlist for "MEDIUM" or higher grade ciphers.

       tls_low_cipherlist (ALL:!EXPORT:+RC4:@STRENGTH)
	      The OpenSSL cipherlist for "LOW" or higher grade ciphers.

       tls_export_cipherlist (ALL:+RC4:@STRENGTH)
	      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 2.4 and later:

       smtp_sasl_tls_verified_security_options ($smtp_sasl_tls_security_options)
	      The  SASL authentication security options that the Postfix SMTP client uses for TLS
	      encrypted SMTP sessions with a verified server certificate.

       Available in Postfix version 2.5 and later:

       smtp_tls_fingerprint_cert_match (empty)
	      List of acceptable remote SMTP server certificate  fingerprints  for  the  "finger-
	      print" TLS security level (smtp_tls_security_level = fingerprint).

       smtp_tls_fingerprint_digest (md5)
	      The  message digest algorithm used to construct remote SMTP server certificate fin-
	      gerprints.

       Available in Postfix version 2.6 and later:

       smtp_tls_protocols (!SSLv2)
	      List of TLS protocols that the Postfix SMTP client will  exclude	or  include  with
	      opportunistic TLS encryption.

       smtp_tls_ciphers (export)
	      The minimum TLS cipher grade that the Postfix SMTP client will use with opportunis-
	      tic TLS encryption.

       smtp_tls_eccert_file (empty)
	      File with the Postfix SMTP client ECDSA certificate in PEM format.

       smtp_tls_eckey_file ($smtp_tls_eccert_file)
	      File with the Postfix SMTP client ECDSA private key in PEM format.

       Available in Postfix version 2.7 and later:

       smtp_tls_block_early_mail_reply (no)
	      Try to detect a mail  hijacking  attack  based  on  a  TLS  protocol  vulnerability
	      (CVE-2009-3555),	where  an attacker prepends malicious HELO, MAIL, RCPT, DATA com-
	      mands to a Postfix SMTP client TLS session.

       Available in Postfix version 2.8 and later:

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

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.

       smtp_use_tls (no)
	      Opportunistic  mode:  use TLS when a remote SMTP server announces STARTTLS support,
	      otherwise send the mail in the clear.

       smtp_enforce_tls (no)
	      Enforcement mode: require that remote SMTP servers use TLS  encryption,  and  never
	      send mail in the clear.

       smtp_tls_enforce_peername (yes)
	      With mandatory TLS encryption, require that the remote SMTP server hostname matches
	      the information in the remote SMTP server certificate.

       smtp_tls_per_site (empty)
	      Optional lookup tables with the Postfix SMTP client TLS usage  policy  by  next-hop
	      destination and by remote SMTP server hostname.

       smtp_tls_cipherlist (empty)
	      Obsolete Postfix < 2.3 control for the Postfix SMTP client TLS cipher list.

RESOURCE AND RATE CONTROLS
       smtp_destination_concurrency_limit ($default_destination_concurrency_limit)
	      The maximal number of parallel deliveries to the same destination via the smtp mes-
	      sage delivery transport.

       smtp_destination_recipient_limit ($default_destination_recipient_limit)
	      The maximal number of recipients per message for the smtp message  delivery  trans-
	      port.

       smtp_connect_timeout (30s)
	      The  SMTP client time limit for completing a TCP connection, or zero (use the oper-
	      ating system built-in time limit).

       smtp_helo_timeout (300s)
	      The SMTP client time limit for sending the HELO or EHLO command, and for	receiving
	      the initial server response.

       lmtp_lhlo_timeout (300s)
	      The LMTP client time limit for sending the LHLO command, and for receiving the ini-
	      tial server response.

       smtp_xforward_timeout (300s)
	      The SMTP client time limit for sending the XFORWARD command, and for receiving  the
	      server response.

       smtp_mail_timeout (300s)
	      The SMTP client time limit for sending the MAIL FROM command, and for receiving the
	      server response.

       smtp_rcpt_timeout (300s)
	      The SMTP client time limit for sending the SMTP RCPT TO command, and for	receiving
	      the server response.

       smtp_data_init_timeout (120s)
	      The SMTP client time limit for sending the SMTP DATA command, and for receiving the
	      server response.

       smtp_data_xfer_timeout (180s)
	      The SMTP client time limit for sending the SMTP message content.

       smtp_data_done_timeout (600s)
	      The SMTP client time limit for sending the SMTP ".", and for receiving  the  server
	      response.

       smtp_quit_timeout (300s)
	      The  SMTP  client  time  limit  for sending the QUIT command, and for receiving the
	      server response.

       Available in Postfix version 2.1 and later:

       smtp_mx_address_limit (5)
	      The maximal number of MX (mail exchanger) IP addresses that can  result  from  mail
	      exchanger lookups, or zero (no limit).

       smtp_mx_session_limit (2)
	      The maximal number of SMTP sessions per delivery request before giving up or deliv-
	      ering to a fall-back relay host, or zero (no limit).

       smtp_rset_timeout (20s)
	      The SMTP client time limit for sending the RSET  command,  and  for  receiving  the
	      server response.

       Available in Postfix version 2.2 and earlier:

       lmtp_cache_connection (yes)
	      Keep Postfix LMTP client connections open for up to $max_idle seconds.

       Available in Postfix version 2.2 and later:

       smtp_connection_cache_destinations (empty)
	      Permanently enable SMTP connection caching for the specified destinations.

       smtp_connection_cache_on_demand (yes)
	      Temporarily enable SMTP connection caching while a destination has a high volume of
	      mail in the active queue.

       smtp_connection_reuse_time_limit (300s)
	      The amount of time during which Postfix will use an SMTP connection repeatedly.

       smtp_connection_cache_time_limit (2s)
	      When SMTP connection caching is enabled, the amount of time  that  an  unused  SMTP
	      client socket is kept open before it is closed.

       Available in Postfix version 2.3 and later:

       connection_cache_protocol_timeout (5s)
	      Time limit for connection cache connect, send or receive operations.

TROUBLE SHOOTING CONTROLS
       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 protocol 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.

MISCELLANEOUS CONTROLS
       best_mx_transport (empty)
	      Where the Postfix SMTP client should deliver mail when it  detects  a  "mail  loops
	      back to myself" error condition.

       config_directory (see 'postconf -d' output)
	      The default location of the Postfix main.cf and master.cf configuration 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.

       delay_logging_resolution_limit (2)
	      The maximal number of digits after the decimal point when logging sub-second  delay
	      values.

       disable_dns_lookups (no)
	      Disable DNS lookups in the Postfix SMTP and LMTP clients.

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

       inet_protocols (ipv4)
	      The Internet protocols Postfix will attempt to use when making or accepting connec-
	      tions.

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

       lmtp_assume_final (no)
	      When an LMTP server announces no DSN support, assume that the server performs final
	      delivery, and send "delivered" delivery status notifications instead of "relayed".

       lmtp_tcp_port (24)
	      The default TCP port that the Postfix LMTP client connects to.

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

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

       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.

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

       smtp_address_preference (ipv6)
	      The  address  type  ("ipv6", "ipv4" or "any") that the Postfix SMTP client will try
	      first, when a destination has IPv6 and IPv4 addresses with equal MX preference.

       smtp_bind_address (empty)
	      An optional numerical network address that the Postfix SMTP client should  bind  to
	      when making an IPv4 connection.

       smtp_bind_address6 (empty)
	      An  optional  numerical network address that the Postfix SMTP client should bind to
	      when making an IPv6 connection.

       smtp_helo_name ($myhostname)
	      The hostname to send in the SMTP EHLO or HELO command.

       lmtp_lhlo_name ($myhostname)
	      The hostname to send in the LMTP LHLO command.

       smtp_host_lookup (dns)
	      What mechanisms the Postfix SMTP client uses to look up a host's IP address.

       smtp_randomize_addresses (yes)
	      Randomize the order of equal-preference MX host addresses.

       syslog_facility (mail)
	      The syslog facility of Postfix logging.

       syslog_name (see 'postconf -d' output)
	      The mail system name that is prepended to the process name in  syslog  records,  so
	      that "smtpd" becomes, for example, "postfix/smtpd".

       Available with Postfix 2.2 and earlier:

       fallback_relay (empty)
	      Optional	list of relay hosts for SMTP destinations that can't be found or that are
	      unreachable.

       Available with Postfix 2.3 and later:

       smtp_fallback_relay ($fallback_relay)
	      Optional list of relay hosts for SMTP destinations that can't be found or that  are
	      unreachable.

SEE ALSO
       generic(5), output address rewriting
       header_checks(5), message header content inspection
       body_checks(5), body parts content inspection
       qmgr(8), queue manager
       bounce(8), delivery status reports
       scache(8), connection cache server
       postconf(5), configuration parameters
       master(5), generic daemon options
       master(8), process manager
       tlsmgr(8), TLS session and PRNG management
       syslogd(8), system logging

README FILES
       Use "postconf readme_directory" or "postconf html_directory" to locate this information.
       SASL_README, Postfix SASL howto
       TLS_README, Postfix STARTTLS howto

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

       Command pipelining in cooperation with:
       Jon Ribbens
       Oaktree Internet Solutions Ltd.,
       Internet House,
       Canal Basin,
       Coventry,
       CV1 4LY, United Kingdom.

       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 and SMTP connection cache support by:
       Victor Duchovni
       Morgan Stanley

											  SMTP(8)


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