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postfwd page

News
Jun 2020: postfwd3 2.03 is available at postfwd-2.03 (tarball). Please refer to the changelog and the manual for more information.
Mar 2019: postfwd pre-built docker images are now based on alpine linux at DockerHub.
Nov 2018: postfwd can be found at GitHub.
Mar 2018: postfwd.org is now available via HTTPS.

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).

Features

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

Ressources

Quickstart guide
Online documentation
postfwd1 vs postfwd2
Workflow description
Basic configuration example
Rate limit examples
Docker container support
Download tarball with both versions [350KB]
How to setup up a chroot environment for postfwd2
hapolicy high availability and loadbalancing for policy services
Source v1,v2 | Changelog v1,v2 | development versions | 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.

Required PERL modules

mandatory

Net::DNS
Net::Server

optional

NetAddr::IP
Net::CIDR::Lite
Digest::MD5
Time::HiRes
Storable

To install them you may either run:

	perl -MCPAN -e shell
	install <Module>

or get them from CPAN archive and run:

	perl Makefile.pl
	make
	make test
	make install

On debian based distributions you could run:

	apt-get update && apt-get install \
		libnet-dns-perl \
		libnet-server-perl \
		libnetaddr-ip-perl \
		libnet-cidr-lite-perl \
		libtime-hires-perl \
		libstorable-perl

On alpine you could run:

	apk update && apk add \
	        perl \
        	perl-net-dns \
	        perl-net-server \
        	perl-netaddr-ip \
	        perl-net-cidr-lite \
        	perl-time-hires \
	        perl-io-multiplex

Donations
Development, testing and hosting of postfwd consumes time and ressources. It is and will stay free software (see "License" below). If you want to support this, consider a donation at https://www.paypal.me/postfwd.

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 below:

Copyright (c) 2007 - 2019, 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.

THIS SOFTWARE IS PROVIDED BY ME ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

http://www.postfwd.org/

2007 by Jan Peter Kessler

info (AT) postfwd (DOT) org