Postfix manual - qmqpd(8)

    QMQPD(8)                                                              QMQPD(8)

    NAME
           qmqpd - Postfix QMQP server

    SYNOPSIS
           qmqpd [generic Postfix daemon options]

    DESCRIPTION
           The  Postfix  QMQP server receives one message per connec-
           tion.  Each message is piped through the  cleanup(8)  dae-
           mon,  and  is placed into the incoming queue as one single
           queue file.  The program expects to be run from  the  mas-
           ter(8) process manager.

           The QMQP server implements one access policy: only explic-
           itly authorized client hosts are allowed to use  the  ser-
           vice.

    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 mes-
           sage 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 component 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  mes-
                  sage to the specified transport:destination.

           receive_override_options (empty)
                  Enable  or  disable  recipient validation, built-in
                  content filtering, 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 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 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.

           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  termi-
                  nating 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  direc-
                  tory.

           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".

           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)