QMQPD(8) System Manager's Manual QMQPD(8)

qmqpd - Postfix QMQP server

qmqpd [generic Postfix daemon options]

The Postfix QMQP server receives one message per connection. Each message 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 authorized client hosts are allowed to use the service.



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.










Problems and transactions are logged to syslogd(8).










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
    component is longer than acceptable, Postfix replies immediately and closes
    the connection. It is left up to the client to handle the situation.










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.











  

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

  

  
Enable or disable recipient validation, built-in content filtering, or
      address mapping.












Preliminary SMTPUTF8 support is introduced with Postfix 3.0.



  

  
Enable preliminary SMTPUTF8 support for the protocols described in RFC
      6531..6533.

  

  
Detect that a message requires SMTPUTF8 support for the specified mail
      origin classes.




Available in Postfix version 3.2 and later:



  

  
Enable 'transitional' compatibility between IDNA2003 and IDNA2008, when
      converting UTF-8 domain names to/from the ASCII form that is used for DNS
      lookups.













  

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

  

  
The maximal number of Received: message headers that is allowed in the
      primary message headers.

  

  
The maximal size in bytes of a message, including envelope
    information.

  

  
The time limit for sending or receiving information over the network.













  

  
The increment in verbose logging level when a remote client or server
      matches a pattern in the debug_peer_list parameter.

  

  
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.

  

  
Safety net to keep mail queued that would otherwise be returned to the
      sender.













  

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













  

  
The default location of the Postfix main.cf and master.cf configuration
      files.

  

  
How much time a Postfix daemon process may take to handle a request before
      it is terminated by a built-in watchdog timer.

  

  
The time limit for sending or receiving information over an internal
      communication channel.

  

  
The maximum amount of time that an idle Postfix daemon process waits for
      an incoming connection before terminating voluntarily.

  

  
The maximal number of incoming connections that a Postfix daemon process
      will service before terminating voluntarily.

  

  
The process ID of a Postfix command or daemon process.

  

  
The process name of a Postfix command or daemon process.

  

  
What remote QMQP clients are allowed to connect to the Postfix QMQP server
      port.

  

  
The location of the Postfix top-level queue directory.

  

  
The syslog facility of Postfix logging.

  

  
A prefix that is prepended to the process name in syslog records, so that,
      for example, "smtpd" becomes "prefix/smtpd".

  

  
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:



  

  
Enable logging of the remote QMQP client port in addition to the hostname
      and IP address.










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










Use "postconf readme_directory" or
    "postconf html_directory" to locate this information.


QMQP_README, Postfix ezmlm-idx howto.










The Secure Mailer license must be distributed with this
  software.








The qmqpd service was introduced with Postfix version 1.1.








Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
Wietse Venema
Google, Inc.
111 8th Avenue
New York, NY 10011, USA