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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
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.
Address to send a copy of each message that enters the system.
Increment in verbose logging level when a remote host matches a pattern in the
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 parame-
Limit the number of Received: message headers.
A list of domain or network patterns that specifies what clients are allowed to use
Limit the time to send a server response and to receive a client request.
Change hard (D) reject responses into soft (Z) reject responses. This can be use-
ful for testing purposes.
Content inspection controls
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 syn-
tax as the right-hand side of a Postfix transport table.
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.
Limit the total size in bytes of a message, including on-disk storage for sender
and recipient address information.
Time to wait in seconds before informing the client of a problem. This slows down
http://cr.yp.to/proto/qmqp.html, QMQP protocol
cleanup(8) message canonicalization
master(8) process manager
syslogd(8) system logging
The Secure Mailer license must be distributed with this software.
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
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