Hi, These are a real concern. If you receive any kind of real mail volume, you're receiving these too, and they're not always being caught by RBLs or virus scanners. Or even our well-trained bayes.
http://pastebin.com/YhLBqpKm I used to have some rules that would reliably block them, but they're not performing well now at all. I'm posting this in hopes someone has some other ideas, as well as to raise awareness about their existence. Ideas greatly appreciated. Alex
