Free spam solution software for windows

SpamAssassin is one of the best spam filters and it is also free. However, it is written on Perl and runs usually on corporate UNIX servers.
The early versions of SpamAssassin did excellent job killing spam, but they just could not run on Win32 systems. The first successful attempt to port SpamAssassin to Microsoft Windows family was made by Dan McDonald, who wrote a pop3proxy script which was acting as a proxy between the mail client and the POP3 server.
Further work on this script lead to the release of a free spam filter SAproxy and then commercial SAproxy Pro. Soon after the release in 2003, Consumer Reports declared SAproxy the best personal anti-spam solution for Windows. However, after Yahoo! acquired Stata Labs at the end of 2004, they announced that SAproxy was discontinued.
I have managed to adapt the free SAproxy to work with the latest versions of SpamAssassin, DCC, and Razor. The result, SpamAssassin POP3 Proxy for Win32, is available for download. The spam filter stands between your e-mail reader and the POP3 (incoming) mail server. It can:
- study the message
and check whether it matches patterns common for spam;
- contact online "blacklists" (DNSBL) to verify whether the message has arrived from a known spam source;
- contact online databases DCC and Razor (Cloudmark) which collect the "fingerprints" of millions of known spam messages;
- automatically learn how to tell spam from non-spam (statistical analysis);
- automatically whitelist frequent senders;
- easily configure basic settings with the help of a user-friendly interface;
- support custom rules (although that would require reading SpamAssassin documentation).
Synopsis
spamassassin [options] [ < mailmessage | path ... ]
spamassassin -d [ < mailmessage | path ... ]
spamassassin -r [ < mailmessage | path ... ]
spamassassin -k [ < mailmessage | path ... ]
spamassassin -W|-R [ < mailmessage | path ... ]
Options:
-L, --local -> Local tests only (no online tests)
-r, --report -> Report message as spam
-k, --revoke -> Revoke message as spam
-d, --remove-markup -> Remove spam reports from a message
-C path, --configpath=path, --config-file=path -> Path to standard configuration dir
-p prefs, --prefspath=file, --prefs-file=file -> Set user preferences file
--siteconfigpath=path -> Path for site configs (def: /etc/mail/spamassassin)
-x, --nocreate-prefs -> Dont create user preferences file
-e, --exit-code -> Exit with a non-zero exit code if the tested message was spam
--mbox -> read in messages in mbox format
--mbx -> read in messages in UW mbx format
-t, --test-mode -> Pipe message through and add extra report to the bottom
--lint -> Lint the rule set: report syntax errors
-W, --add-to-whitelist -> Add addresses in mail to persistent address whitelist
--add-to-blacklist -> Add addresses in mail to persistent address blacklist
-R, --remove-from-whitelist -> Remove all addresses found in mail from persistent address list
--add-addr-to-whitelist=addr -> Add addr to persistent address whitelist
--add-addr-to-blacklist=addr -> Add addr to persistent address blacklist
--remove-addr-from-whitelist=addr -> Remove addr from persistent address list
--progress -> Print progress bar
-D, --debug [area=n,...] -> Print debugging messages
-V, --version -> Print version
-h, --help -> Print usage message

Spam Terrier - Spam Terrier brings comprehensive antispam protection to users of varying computer skills. It comes free and doesnt stress even a low-end computer. Effortlessly integrating into popular email applications such as The Bat! and Vista-included Windows Mail, the program provides a wide array of filtering options, including self-learning Bayesian-based filter that can be trained to individual preferences. AS you train the filter, it will improve spam detection as it learns new spam characteristics and adjusts to them. Other filtering criteria include senders white- and blacklists, customized message content that will be analyzed when the mail arrives. On-demand spam scan allows for scanning of already received messages throughout any folder. These, plus a handful of other innovative features make Spam Terrier the ideal antispam solution. The program supports Windows 64-bit platforms, providing automated and hassle-free spam protection for new-age computing.

Time-based database separation.
Faster and more granular processing.
Database size balancing.
Accelerated learning from the interface.

First release. Fixed bugs reported since beta.