Eudora has a FlameWatch feature that tries to guess if the message you are sending might be offensive to the recipients, to help you rethink what you are about to send. I leave it on for fun, because it often picks very innocuous things as offensive, and sometimes picks things as offensive that I can't even figure out at all. In any event, it has a scale of one pepper to three, and when you hit Send it says "Your message may cause offense."
Might this be a good feature for Slash? :-)/2
