How to reject spam with embedded graphics

[Chris Lale <chrislale@untrammelled.co.uk>]

There was some discussion on the list a while ago about how to deal with 
spam that has text as graphics embedded in it. There was disagreement 
about whether or not to use it to teach SpamAssassin. I have continued 
feeding this spam to SpamAssassin, but a large amount still gets through.

Does anyone know of a way to deal with spam with embedded graphics? I 
cannot use greylisting on a home desktop machine.

Any thoughts welcome.

--
Chris.