We've been looking and trialling No Spam Today which is based upon spamassasin. When we first tried it, it was catching probably 99% of all spam. However, over the past three months this figure has decreased noticeably. It appears to be because spammers are spelling words incorrectly - sometimes completely misspelled but recognisable to a human reader.
Does this call into doubt the validity of word/phrase blocking as used in spamassasin?
No, because recent versions of spamassassin also use a Bayes engine, which can be quickly trained for these kinds of things.
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