Linux/Unix server side anti-spam software:
- Spamazoid from Pathlink (same people who bring you Newsguy.com) for spam/viruses. "Installed on your local Linux or Solaris server, Spamazoid guards your mail service and users against damaging messages, without disrupting valid communications.
Spamazoid eliminates spam and viruses with 99.99% accuracy, and does so: without using undefined blacklists, without installing intrusive programs, and without placing a burden on users to participate in the constant update drudgery associated with most anti-spam/virus software."
- MailShield from Lyris. MailShield Server uses a "fuzzy logic" filtering engine and "includes both the SpamAssassin and Mailshell Spam Recognition System engines, for best-in-class spam detection. These engines run hundreds of thousands of checks against all incoming mail, thereby assigning points to each message Ñ the more points, the greater the probability that an individual message is spam. Depending on the result of these tests, MailShield Server can quarantine, mark, redirect, or bounce undesirable mail."
- TMDA (Tagged Message Delivery Agent) by Jason R. Mastaler for Unix/Linux sits at the server level. " TMDA combines a "whitelist" (for known/trusted senders), a "blacklist" (for undesired senders), and a cryptographically enhanced confirmation system (for unknown, but legitimate senders). TMDA strives to be more effectual, yet less time-consuming than traditional filters."
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