lmtp



LMTP(8)                                                                LMTP(8)




NAME

       lmtp - Postfix local delivery via LMTP


SYNOPSIS

       lmtp [generic Postfix daemon options]


DESCRIPTION

       The LMTP client processes message delivery requests from the queue man-
       ager. 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 LMTP client updates the queue file and  marks  recipients  as  fin-
       ished,  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  LMTP  client  connects to the destination specified in the message
       delivery request. The destination, usually  specified  in  the  Postfix
       transport(5) table, has the 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 changed root directory.

       inet:host, inet:host:port (symbolic host)

       inet:[addr], inet:[addr]:port (numeric host)
              Connect to the specified IPV4 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  service  is  found,
              the  lmtp_tcp_port configuration parameter (default value of 24)
              will be used.

              The LMTP client does not perform  MX  (mail  exchanger)  lookups
              since those are defined only for mail delivery via SMTP.

       If neither unix: nor inet: are specified, inet: is assumed.


SECURITY

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


STANDARDS

       RFC 821 (SMTP protocol)
       RFC 1651 (SMTP service extensions)
       RFC 1652 (8bit-MIME transport)
       RFC 1870 (Message Size Declaration)
       RFC 2033 (LMTP protocol)
       RFC 2554 (AUTH command)
       RFC 2821 (SMTP protocol)
       RFC 2920 (SMTP Pipelining)


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 postmas-
       ter is notified of bounces, protocol problems, and of other trouble.


CONFIGURATION PARAMETERS

       Changes to main.cf are picked up automatically,  as  lmtp(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

       lmtp_skip_quit_response (no)
              Wait for the response to the LMTP QUIT command.


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 proto-
              col errors.

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


EXTERNAL CONTENT INSPECTION CONTROLS

       Available in Postfix version 2.1 and later:

       lmtp_send_xforward_command (no)
              Send an XFORWARD command to the LMTP server when the  LMTP  LHLO
              server response announces XFORWARD support.


SASL AUTHENTICATION CONTROLS

       lmtp_sasl_auth_enable (no)
              Enable SASL authentication in the Postfix LMTP client.

       lmtp_sasl_password_maps (empty)
              Optional  LMTP  client  lookup tables with one username:password
              entry per host or domain.

       lmtp_sasl_security_options (noplaintext, noanonymous)
              What  authentication  mechanisms  the  Postfix  LMTP  client  is
              allowed to use.


RESOURCE AND RATE CONTROLS

       In the text below, transport is the name of the service as specified in
       the master.cf file.

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

       transport_destination_concurrency_limit   ($default_destination_concur-
       rency_limit)
              Limit  the number of parallel deliveries to the same destination
              via this mail delivery transport.

       transport_destination_recipient_limit     ($default_destination_recipi-
       ent_limit)
              Limit the number of recipients per  message  delivery  via  this
              mail delivery transport.

              This  parameter  becomes  significant if the LMTP client is used
              for local delivery.  Some LMTP servers can optimize delivery  of
              the  same  message to multiple recipients. The default limit for
              local mail delivery is 1.

              Setting this parameter to 0 will lead to an unbounded number  of
              recipients  per delivery.  However, this could be risky since it
              may make the machine vulnerable to running out of  resources  if
              messages  are  encountered  with an inordinate number of recipi-
              ents.  Exercise care when setting this parameter.

       lmtp_connect_timeout (0s)
              The LMTP client time limit for completing a TCP  connection,  or
              zero (use the operating system built-in time limit).

       lmtp_lhlo_timeout (300s)
              The  LMTP client time limit for receiving the LMTP greeting ban-
              ner.

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

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

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

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

       lmtp_data_xfer_timeout (180s)
              The LMTP client time limit for sending the LMTP message content.

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

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

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


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.

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

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

       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 the next service request before exiting.

       max_use (100)
              The maximal number of connection requests before a Postfix  dae-
              mon process terminates.

       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.

       syslog_facility (mail)
              The syslog facility of Postfix logging.

       syslog_name (postfix)
              The  mail  system  name that is prepended to the process name in
              syslog records, so that "smtpd"  becomes,  for  example,  "post-
              fix/smtpd".


SEE ALSO

       bounce(8), delivery status reports
       qmgr(8), queue manager
       postconf(5), configuration parameters
       master(5), generic daemon options
       services(4), Internet services and aliases
       master(8), process manager
       syslogd(8), system logging


README FILES

       Use  "postconf readme_directory" or "postconf html_directory" to locate
       this information.
       LMTP_README, Postfix LMTP client howto
       VIRTUAL_README, virtual delivery agent 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

       Alterations for LMTP by:
       Philip A. Prindeville
       Mirapoint, Inc.
       USA.

       Additional work on LMTP by:
       Amos Gouaux
       University of Texas at Dallas
       P.O. Box 830688, MC34
       Richardson, TX 75083, USA



                                                                       LMTP(8)

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