Comment 95% accuracy (Score 1) 81
While 95% accuracy at detecting spam may sound like "wow", it's a very low rate. Simply using correctly configured greylisting gives an accuracy in the 99% range. So I doubt this technique really improves anything but it will allow to say 'we did it another way'. Given than more and more spam comes from official mail relays, accuracy will only increase when analysing the body of the mail.