Just a comment to Dallas that his (? making a guess there) ImageInfo module seems to be doing a good job for me.
I had a small sample of image-spam that currently gets past SA. Almost all of it scored +4/+5 points with his module activated. I also had a few recent inline-images "real" emails - didn't trigger any of these rules. So far I'm impressed :-) Jason -- Cheers Jason Haar Information Security Manager, Trimble Navigation Ltd. Phone: +64 3 9635 377 Fax: +64 3 9635 417 PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1