SpamAssassin rule developers might be interested in this post over at my blog:
> So far, most SpamAssassin text rules are manually developed; somebody > looks at a few spam samples, spots common phrases, and writes a rule to > match that. It'd be great to automate more of that work. Here's an > algorithm I've developed to perform this in a memory-efficient and > time-efficient way. http://taint.org/2007/03/05/134447a.html --j.
