Only the part before the AT-sign is case-sensitive. There are both good and bad reasons to have multiple subscriptions. Having multiples is not necessarily bad. It IS difficult to manipulate subscripton options though for a single subscription when multiple case-sensitive ones exist. If the problem is an abuse issue, then SET listname REVIEW (or perhaps NOPOST). Or exclude via wild-card list definition FILTERing. At 11:56 09/17/2001 Monday, David Hopkins wrote: >How do you deal with a subscriber who subscribes two or more times using >different CASE in their mail address? > >For example, Joe Blow signed up with: > > [log in to unmask] > [log in to unmask]