1QMQPD(8)                    System Manager's Manual                   QMQPD(8)
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NAME

6       qmqpd - Postfix QMQP server
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SYNOPSIS

9       qmqpd [generic Postfix daemon options]
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DESCRIPTION

12       The Postfix QMQP server receives one message per connection.  Each mes‐
13       sage is piped through the cleanup(8) daemon, and  is  placed  into  the
14       incoming queue as one single queue file.  The program expects to be run
15       from the master(8) process manager.
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17       The QMQP server implements one access policy:  only  explicitly  autho‐
18       rized client hosts are allowed to use the service.
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SECURITY

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

26       Problems and transactions are logged to syslogd(8).
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BUGS

29       The  QMQP protocol provides only one server reply per message delivery.
30       It is therefore not possible to reject individual recipients.
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32       The QMQP protocol requires the server to  receive  the  entire  message
33       before  replying. If a message is malformed, or if any netstring compo‐
34       nent is longer than acceptable, Postfix replies immediately and  closes
35       the connection. It is left up to the client to handle the situation.
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CONFIGURATION PARAMETERS

38       Changes  to  main.cf are picked up automatically, as qmqpd(8) processes
39       run for only a limited amount of time. Use the command "postfix reload"
40       to speed up a change.
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42       The  text  below provides only a parameter summary. See postconf(5) for
43       more details including examples.
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CONTENT INSPECTION CONTROLS

46       content_filter (empty)
47              The name of a mail delivery transport that filters mail after it
48              is queued.
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50       receive_override_options (empty)
51              Enable or disable recipient validation, built-in content filter‐
52              ing, or address mapping.
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RESOURCE AND RATE CONTROLS

55       line_length_limit (2048)
56              Upon input, long lines are chopped up into  pieces  of  at  most
57              this length; upon delivery, long lines are reconstructed.
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59       hopcount_limit (50)
60              The maximal number of Received:  message headers that is allowed
61              in the primary message headers.
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63       message_size_limit (10240000)
64              The maximal size in  bytes  of  a  message,  including  envelope
65              information.
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67       qmqpd_timeout (300s)
68              The  time  limit  for  sending or receiving information over the
69              network.
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TROUBLE SHOOTING CONTROLS

72       debug_peer_level (2)
73              The increment in verbose logging level when a remote  client  or
74              server matches a pattern in the debug_peer_list parameter.
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76       debug_peer_list (empty)
77              Optional  list  of  remote  client or server hostname or network
78              address  patterns  that  cause  the  verbose  logging  level  to
79              increase by the amount specified in $debug_peer_level.
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81       soft_bounce (no)
82              Safety  net to keep mail queued that would otherwise be returned
83              to the sender.
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TARPIT CONTROLS

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

91       config_directory (see 'postconf -d' output)
92              The  default  location of the Postfix main.cf and master.cf con‐
93              figuration files.
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95       daemon_timeout (18000s)
96              How much time a Postfix daemon process  may  take  to  handle  a
97              request before it is terminated by a built-in watchdog timer.
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99       ipc_timeout (3600s)
100              The  time  limit  for  sending  or receiving information over an
101              internal communication channel.
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103       max_idle (100s)
104              The maximum amount of time that an idle Postfix  daemon  process
105              waits for an incoming connection before terminating voluntarily.
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107       max_use (100)
108              The maximal number of incoming connections that a Postfix daemon
109              process will service before terminating voluntarily.
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111       process_id (read-only)
112              The process ID of a Postfix command or daemon process.
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114       process_name (read-only)
115              The process name of a Postfix command or daemon process.
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117       qmqpd_authorized_clients (empty)
118              What clients are allowed to connect to the QMQP server port.
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120       queue_directory (see 'postconf -d' output)
121              The location of the Postfix top-level queue directory.
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123       syslog_facility (mail)
124              The syslog facility of Postfix logging.
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126       syslog_name (postfix)
127              The mail system name that is prepended to the  process  name  in
128              syslog  records,  so  that  "smtpd" becomes, for example, "post‐
129              fix/smtpd".
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131       verp_delimiter_filter (-=+)
132              The characters Postfix accepts as VERP delimiter  characters  on
133              the Postfix sendmail(1) command line and in SMTP commands.
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SEE ALSO

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

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

147       The Secure Mailer license must be distributed with this software.
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HISTORY

150       The qmqpd service was introduced with Postfix version 1.1.
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AUTHOR(S)

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