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       lmtp [generic Postfix daemon options]


       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  problem  reports  are  sent  to  the
       bounce(8) or defer(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:

              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.


       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.


       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)


       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.


              Verbose logging level increment for hosts that match  a  pattern
              in the debug_peer_list parameter.

              List of domain or network patterns. When a remote host matches a
              pattern, increase the verbose logging level by the amount speci-
              fied in the debug_peer_level parameter.

              Recipient of protocol/policy/resource/software error notices.

              When  this  parameter  includes the protocol class, send mail to
              the postmaster with transcripts of LMTP sessions  with  protocol

              Do not wait for the server response after sending QUIT.

              The  TCP port to be used when connecting to a LMTP server.  Used
              as backup if the lmtp service is not found in services(4).

Authentication controls

              Enable per-session authentication as per RFC  2554  (SASL).   By
              default, Postfix is built without SASL support.

              Lookup tables with per-host or domain name:password entries.  No
              entry for a host means no attempt to authenticate.

              Zero or more of the following.

                     Disallow authentication methods that use plaintext  pass-

                     Disallow  authentication  methods  that are vulnerable to
                     non-dictionary active attacks.

                     Disallow authentication methods that  are  vulnerable  to
                     passive dictionary attack.

                     Disallow anonymous logins.

Resource controls

              Should  we  cache  the connection to the LMTP server? The effec-
              tiveness of cached connections will be determined by the  number

              ·      The per-process limit on the number of delivery  requests
                     is  reached.   This  limit  is specified with the Postfix
                     max_use configuration parameter.

              ·      Upon the onset of  another  delivery  request,  the  LMTP
                     server  associated  with  the  current  session  does not
                     respond to the RSET command.

              Limit the number of parallel deliveries to the same  destination
              via  this  mail delivery transport. transport is the name of the
              service as specified in the file.  The  default  limit
              is  taken from the default_destination_concurrency_limit parame-

              Limit the number of recipients per  message  delivery  via  this
              mail delivery transport. transport is the name of the service as
              specified in the file.  The  default  limit  is  taken
              from the default_destination_recipient_limit parameter.

              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.

Timeout controls

       The default time unit is seconds; an explicit time unit can  be  speci-
       fied  by  appending  a  one-letter  suffix to the value: s (seconds), m
       (minutes), h (hours), d (days) or w (weeks).

              Timeout for opening a connection to the LMTP server.  If no con-
              nection  can  be  made  within  the  deadline,  the  message  is

              Timeout for sending the LHLO  command,  and  for  receiving  the
              server response.

              Timeout for sending the MAIL FROM command, and for receiving the
              server response.

              Timeout for sending the RCPT TO command, and for  receiving  the
              server response.


              Timeout for sending the RSET  command,  and  for  receiving  the
              server response.

              Timeout  for  sending  the  QUIT  command, and for receiving the
              server response.


       bounce(8) non-delivery status reports
       local(8) local mail delivery
       master(8) process manager
       qmgr(8) queue manager
       services(4) Internet services and aliases
       spawn(8) auxiliary command spawner
       syslogd(8) system logging


       The Secure Mailer license must be distributed with this software.


       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.

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


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