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How are the worst offenders identified

A series of litmus tests has been defined, each test looks for different clues that may (when seen together) make it obvious that a message really is spam. for example, the IP test looks for multiple messages that come from the same IP address.

What litmus tests are there?

1. IP Address - multiple messages from one source.
2. MD5 - multiple messages where the body text has the same MD5 hash
3. Link Count - messages that contain more than n Links.
4. Domain - Messages advertising the same URL
5. Email - multiple messages from one email address.
6. Name length - messages where the author name has more than 5 words

Can more litmus tests be devised?

Yes, the test system is plugabble.