He's written a great series of articles encompassing the whole of the backscatter issue. It should probably be considered required reading. It's nice that he split it up, otherwise it would be massive!
Start reading at the bottom: <http://blogs.msdn.com/tzink/archive/tags/Backscatter/default.aspx> ~JasonG -- ~ Ninja Email Security with Cloudmark Spam Engine Gets Image Spam ~ ~ http://www.sunbeltsoftware.com/Ninja ~
