qmqpd(8) [redhat man page]
QMQPD(8) System Manager's Manual QMQPD(8) NAME
qmqpd - Postfix QMQP server SYNOPSIS
qmqpd [generic Postfix daemon options] DESCRIPTION
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. 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
The following main.cf parameters are especially relevant to this program. See the Postfix main.cf file for syntax details and for default values. Use the postfix reload command after a configuration change. Miscellaneous always_bcc Address to send a copy of each message that enters the system. debug_peer_level Increment in verbose logging level when a remote host matches a pattern in the debug_peer_list parameter. debug_peer_list List of domain or network patterns. When a remote host matches a pattern, increase the verbose logging level by the amount specified in the debug_peer_level parameter. hopcount_limit Limit the number of Received: message headers. qmqpd_authorized_clients A list of domain or network patterns that specifies what clients are allowed to use the service. qmqpd_timeout Limit the time to send a server response and to receive a client request. soft_bounce Change hard (D) reject responses into soft (Z) reject responses. This can be useful for testing purposes. Content inspection controls content_filter The name of a mail delivery transport that filters mail and that either bounces mail or re-injects the result back into Postfix. This parameter uses the same syntax as the right-hand side of a Postfix transport table. Resource controls line_length_limit Limit the amount of memory in bytes used for the handling of partial input lines, and the length of sender and recipient addresses that are received from client. message_size_limit Limit the total size in bytes of a message, including on-disk storage for sender and recipient address information. Tarpitting qmqpd_error_sleep_time Time to wait in seconds before informing the client of a problem. This slows down run-away errors. SEE ALSO
http://cr.yp.to/proto/qmqp.html, QMQP protocol cleanup(8) message canonicalization master(8) process manager syslogd(8) system logging LICENSE
The Secure Mailer license must be distributed with this software. AUTHOR(S) Wietse Venema IBM T.J. Watson Research P.O. Box 704 Yorktown Heights, NY 10598, USA QMQPD(8)
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QMQPD(8postfix) QMQPD(8postfix) NAME
qmqpd - Postfix QMQP server SYNOPSIS
qmqpd [generic Postfix daemon options] DESCRIPTION
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. 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 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 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, "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
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(8postfix)