IBM's AlphaWorks has an announcement for
a Java-based commercial mail filtering system.
"FairUCE (which stands for "Fair use of Unsolicited Commercial Email") is a spam filter that stops spam by verifying sender identity instead of filtering content. It can stop the vast majority of spam without the use of a content filter and without requiring a probable spam or bulk folder that needs to be checked periodically. As one of the first spam filters that uses sender identity rather than email content to determine if it is legitimate, all this can be accomplished quickly using simple, inexpensive tests.
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