postfwd page

News
Apr 18 2013: New versions postfwd-1.35 and postfwd2-1.35 (tarball with both versions) available. Please read the Changelog.v1 or Changelog.v2 for details.
Apr 18 2013: postfwd.org has moved to a new infrastructure.
Aug 01 2012: Additional rate limit examples available.

Description
postfwd is written in perl to combine complex postfix restrictions in a ruleset similar to those of the most firewalls. The program uses the postfix policy delegation protocol to control access to the mail system before a message has been accepted (please visit http://www.postfix.org/SMTPD_POLICY_README.html for more information). It allows you to choose an action (e.g. reject, dunno) for a combination of several smtp parameters (like sender and recipient address, size or the client's TLS fingerprint).

• Complex combinations of smtp parameters in a single rule
• Macros/ACLs/Groups for frequently used statements
• Combined asynchronous dnsbl lookups with arbitrary actions depending on the results
  (e.g. allows dns whitelists or selective greylisting based on rbl lookup results)
• Automatic deactivation of non-responding dnsbls
• Rate limits for message count and size for any available item (user, client, sender, recipient, ...)
• Scoring system for fine granular access control
• Date/time based rules
• Conditional jumps to certain rules (like iptables -j)
• Internal caching for requests and dns lookups
• Runs as network daemon (no need to spawn processes)
• Built in statistics for rule efficiency analysis

• Quickstart guide
• Online documentation
• postfwd1 vs postfwd2
• Workflow description
• Basic configuration example
• Rate limit examples
• A real-world configuration by Henrik Krohns (external link)
• Download tarball with both verions [343KB]
• How to setup up a chroot environment for postfwd2
• hapolicy high availability and loadbalancing for policy services
• Source v1,v2 | Changelog v1,v2 | development | old versions

Help

• postfwd-news
  Here you will receive the latest announcements regarding new versions and related topics. Volume will be very low. Subscribe to this list at http://listi.jpberlin.de/mailman/listinfo/postfwd-news.
• postfwd-users
  Here users will be able to share their experiences and ask questions regarding the setup or configuration of postfwd. Volume will be low. Subscribe to this list at http://listi.jpberlin.de/mailman/listinfo/postfwd-users.
• contact the developer
  If you don't want to use the public mailinglists you are welcome to share your experiences with postfwd by e-mail to info (AT) postfwd (DOT) org.

• Net::Server::Multiplex
• Net::DNS

• Net::Server::Daemonize
• Net::Server::Multiplex
• Net::Server::PreFork
• Net::DNS

• Time::HiRes

• Storable

• Net::Server::Multiplex
• Net::DNS::Async
• Net::CIDR::Lite

To install them you may either run:

	perl -MCPAN -e shell
	install <Module>
	

	perl Makefile.pl
	make
	make test
	make install
	

License
postfwd is free software and released under BSD license, which basically means that you can do what you want as long as you keep the copyright notice:

Copyright (c) 2007, 2008, Jan Peter Kessler
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
• Neither the name of the authors nor the names of his contributors may be used to endorse or promote products derived from this software without specific prior written permission.