Judging from Simon Cozen's SpamMonkey's documentation 

SpamMonkey is a general purpose spam detection suite. It borrows heavily from SpamAssassin, 
but it is designed to be used for plain text as well as email.

it may suit your needs?

In reply to Re: Filtering SPAM hot words from Message Post by shigetsu
in thread Filtering SPAM hot words from Message Post by Anonymous Monk

Title:
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