Good to know.
I've updated our filtering to match your document, but we still have a lot of spam getting through. I even increased the weight of the Bayesian filter, JWSPAMSPY and UCEPROTECT LEVEL 2 up to 15 each, so failing any one of them will put a message in the spam filter. But we're getting a lot of spam that is passing every single filter.
Are there other blacklists I should look at?