Remail: It's impossible to make anything foolproof, because fools are so ingenious

I've had a lot of people make mistakes when using my remailer. Maybe this is common to happen to most people who run remailers, but the large number of mistakes surprised me. To eliminate the clutter in my inbox, I modified my remailer to check the first line of the message for an Anon-To: or Request-Remailing-To: header, in case the person forgot the double colon. If the first line is blank, it checks the second. This seems to have taken care of most of the problems. But somehow, someone figured out how to defeat my efforts and mess up anyway: They began with the header Encrypted: PGP and then followed it with an unencrypted message...