SAProxy

SAProxy is a non-commercial non-supported proxy packaging. For commercial alternatives, look CommercialWindows

(*note*: see also SpamFuProxy, inhering from SAProxy; open source free little version available; working with SpamAssassin 3.0.2)

(see also SpamAssassin for Win32 for a version with SpamAssassin 3.1.0; this version includes SSL support, unlike SpamFuProxy)

The SAProxy non-commercial proxy continues to be available, althought the integration with SA 3+ is not straitforward.

Free windows based pop3 proxy for SpamAssassin.

SAProxy is based on Pop3Proxy from Dan Mc Donald. It is an open source (perl) proxy server that seems to mostly work for Windows machines. Setting it up is *not* point-and-click easy, however. Needs Perl installation.

SAProxy was derived/repackaged by Dan Mc Donald, Johan Lindstrom and DanielQuinlan (last one commisioned by Stata Labs´s)

SAProxy Phoenix (2004-Oct-22) may be on its way? (Dan Wing has been able to install it with SA 3.0)

Have a look to http://sourceforge.net/mailarchive/forum.php?thread_id=5812011&forum_id=27500

Notes for SAProxy:

Free; With GUI
SaProxyStatus: History, situation and perspectives
SaProxyByHand: How to install SaProxy (without SpamAssassin) from scratch. Not for heart-fainted people, but works for latest SpamAssassin versions (that need to be installed apart, as well as Perl)
SpamAssassin UsingOnWindows How To: install and use SpamAssassin in Windows. Michael Bell has an excellent guide. And a configuration GUI.

Old version, self-installing package, easy to install, packages updated [Pop3Proxy], GUI and (old version) of [SpamAssassin]; no need for Perl installation. Currently available in limbo?
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    *There used to be a "handly available" free version*. [Stata Lab´s FAQ|http://www.statalabs.com/] said (the page is not anymore available. By 2004-Oct-20 this web site had the folloging statements:
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              \[...\] Stata Labs has been acquired by Yahoo! \[...\]
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              \[...\] Will Yahoo! sell Bloomba or SAproxy Pro? *At this time there are no plans for Yahoo! to sell Bloomba or SAproxy Pro* \[...\]
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        _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.
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    *By 9 September 2004 (Not any longer available)* Stata Lab´s web said: [http://www.statalabs.com/support/saproxypro/WebHelp/About_Spam_Assassin.htm]
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    SAproxy Pro complies with the Perl Artistic License in the following ways:
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        Following 3(a) by placing the modifications in the Public Domain 
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        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
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Stata Labs' SAProxy PRO

2004-Oct-20: NOT any longer available

It was a non-free derived-version of SAProxy

SAProxy Pro by Bloomba is a Windows proxy server that's easy to set up and works quite well. It's $30.

Seem to be some claims regarding support.

SaProxy Pro (I have not tested) seems do what SaProxy (to wrap SA and Pop3Proxy in a win installation and GUI, no Perl installation needed) plus interaction (mark spam/ham) to statalabs email client.