[NBLUG/talk] disabling mail on account "mail"

[gandalf at sonic.net]

This is indeed a tough thing to google. I'm getting a bunch of spam at mail at thidomain/thatdomain/theotherdomain on my mailserver. I don't see that the user mail should have a functional mailbox anyway. I've tried a couple things with no success so far. 

Also any suggestions on postmaster? I think it's required, but it gets spam and backsplatter from spam all the time.