On Fri, 2003-08-22 at 07:15, Nils Philippsen wrote: > Maybe because various MTAs map uppercase to lowercase and so having both > "user" and "User" will lead to confusion (who will get > <User@xxxxxxxxxx>)? Just a guess. Any MTA which does this, at least for outgoing mail, is broken. RFC2821 requires case-insensitivity only for PoStMaStEr@, anything else is up to local policy at the receiving site. -- dwmw2