SAProxy

Based on Pop3Proxy from Dan McDonald. Derived by Daniel Quinlan commisioned by Stata Labs´s.

It is a free version.

There used to be a "handly available" free version. Stata Lab´s FAQ said (not anymore):[http://www.statalabs.com/]

What happened to the free version? - Last year, Stata Lab´s offered a free open source version of SAproxy 1.2. This version could also be found in the Open Source community for SpamAssassin. However, the product did not have a simple configuration or intuitive user interface, and, as a result, was difficult for the majority of users to understand and implement. In order to bring the power of SAproxy to a larger audience of users, Stata Labs put in a significant amount of effort to create, SAproxy Pro, which is easier to use, configure and refine. SAproxy Pro is the commercial version of SAproxy, complete with support and ongoing improvements.

Currently (9 September 2004) Stata Lab´s said:
[http://www.statalabs.com/support/saproxypro/WebHelp/About_Spam_Assassin.htm]

SAproxy Pro complies with the Perl Artistic License in the following ways:

Following 3(a) by placing the modifications in the Public Domain

Following 4(b) by distributing a standard version of SpamAssassin, which is available here [http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/spamassassin/] under the "spamassassin" module

Stata Labs' SAProxy PRO

[http://www.statalabs.com/products/saproxy/]

Currently a non-free derived-version