Yesterday afternoon I upgraded our version of Spamassassin from 3.1.0 to 3.1.1. I also ran sa-update so that it would download any new or updated rules. My hope is that this newer version will do a better job at catching the recent stock pumping spam we have seen lately where it is mostly a bunch of gibberish with a large gif containing stock information. If this update does not help, I do have a few more tricks to try before I give up on it.