qmqpd



QMQPD(8)                                                              QMQPD(8)




NAME

       qmqpd - Postfix QMQP server


SYNOPSIS

       qmqpd [generic Postfix daemon options]


DESCRIPTION

       The Postfix QMQP server receives one message per connection.  Each mes-
       sage is piped through the cleanup(8) daemon, and  is  placed  into  the
       incoming queue as one single queue file.  The program expects to be run
       from the master(8) process manager.

       The QMQP server implements one access policy:  only  explicitly  autho-
       rized client hosts are allowed to use the service.


SECURITY

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


DIAGNOSTICS

       Problems and transactions are logged to syslogd(8).


BUGS

       The  QMQP protocol provides only one server reply per message delivery.
       It is therefore not possible to reject individual recipients.

       The QMQP protocol requires the server to  receive  the  entire  message
       before  replying. If a message is malformed, or if any netstring compo-
       nent is longer than acceptable, Postfix replies immediately and  closes
       the connection. It is left up to the client to handle the situation.


CONFIGURATION PARAMETERS

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


CONTENT INSPECTION CONTROLS

       content_filter (empty)
              The name of a mail delivery transport that filters mail after it
              is queued.

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


RESOURCE AND RATE CONTROLS

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

       hopcount_limit (50)
              The maximal number of Received:  message headers that is allowed
              in the primary message headers.

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

       qmqpd_timeout (300s)
              The  time  limit  for  sending or receiving information over the
              network.


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.

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


TARPIT CONTROLS

       qmqpd_error_delay (1s)
              How long the QMQP server will pause before  sending  a  negative
              reply to the client.


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.

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

       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.

       qmqpd_authorized_clients (empty)
              What clients are allowed to connect to the QMQP server port.

       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".

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


SEE ALSO

       http://cr.yp.to/proto/qmqp.html, QMQP protocol
       cleanup(8), message canonicalization
       master(8), process manager
       syslogd(8), system logging


README FILES

       Use  "postconf readme_directory" or "postconf html_directory" to locate
       this information.
       QMQP_README, Postfix ezmlm-idx howto.


LICENSE

       The Secure Mailer license must be distributed with this software.


HISTORY

       The qmqpd service was introduced with Postfix version 1.1.


AUTHOR(S)

       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA



                                                                      QMQPD(8)

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