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

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

SMTPUTF8 CONTROLS
       Preliminary SMTPUTF8 support is introduced with Postfix 2.12.

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

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  Postfix  QMQP server will pause before sending a
              negative reply to the remote QMQP 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 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.

       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 remote QMQP clients are allowed to connect to  the  Postfix
              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 (see 'postconf -d' output)
              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.

       Available in Postfix version 2.5 and later:

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

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
       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)