It would be nice if something like this would do any good, but it won't. Virtually all anti-spam measures are token measures. There's just too much spam out there for them to ever get any of this to work. Some spammers have already started doing this "SEXUALLY EXPLICIT" thing, and I can tell you it has done wonders for cleaning up my inbox. I wish they'd just stop sending me porno spam altogether since I think I've made it pretty clear that I already know where to go to get porn and usually without paying a fucking thing.