Email management tools have proliferated in the last year. This page gives a brief overview of some of the more interesting anti-spam weapons. MailArmory uses a number of these tools, and provides public mirror services to several of them. (Wonder why MailArmory is doing this?)

If you have a free tool we haven't listed please let us know.

Distributed Spam Tools

Some of the most interesting recent developments in spam fighting are using distributed systems to track and block spam on a global basis. These systems work on the idea of sharing information about spam attacks in real-time to catch spammers in the act.

• Distributed Checksum Clearinghouse
  DCC acts as a traffic analysis tool. It watches all mail going through DCC-equipped accounts and servers looking for messages that recur frequently. As each new message comes into your mail server you can ask DCC how many other people have seen similar messages.
• Pyzor
  Pyzor works in a similar fashion to Vipul's Razor, but is designed to be an GPL-licensed alternative to Razor's proprietary server software.
• Vipul's Razor
  Razor acts as a collaborative per-message blacklist. The system maintains a catalog of message signatures that users have reported as spam. The catalog uses a trust/reputation system to help prevent legitimate messages from being maliciously reported as spam.