Dr Skip wrote:
> Very ingenious... However, you've done the equivalent of giving out your 
> password here. Even if you change the system, I suspect there will be those 
> who, now knowing you do such, will forever be identifying the keys and abusing 
> you with your own system...
> 
> The first tier of security is to not reveal you have something in the first place!

That technique goes back a ways.  People often used it with snail-mail. 
  Sign up for a subscription to a magazine with a special middle initial 
or a different first name, etc.  Then when you begin to get junk mail to 
that name, you know they sold your address.  Using it to sort email is a 
clever hack to an old idea.
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