this is probably the best idea i've seen in a long, long time.
the only problem is, i'm fairly good at math, even when drunk. i'm sure most of you are the same.
i think a better idea would be to develop an algorithm that measured the "shitty factor" (SF from now on) of the email. if the SF gets too high or out of control, it will automatically connect you to a councilor or net bot (blends seamlessly with Turing Test competitions) that will try and talk you out of it.
http://blogs.computerworld.com/mail_goggles