SA Proxy (Spam Assassin Proxy) is based on the open source software, Spam Assassin. It runs as a local proxy server that sits between your email software and your POP3 mail account. All you need to do is start SAProxy and configure your email software to connect to it instead of the normal incoming mail server (documentation shows how to do it). The next time you check your email, all spam messages will be tagged with ****SPAM**** in the subject line, allowing you to easily recognize them, or to create a rule in your email software that will move those tagged messages into a separate folder. Spam Assassin uses Bayesian filtering which is highly accurate and can learn from new spam as it is detected. The software does not delete any spam, but only marks it, leaving it up to you what to do with it.

The license of this software is Freeware, you can free download and free use this proxy software.