Hi! I have serious amounts of junkmail in the BadMail folder at one of my customers. The customer is Running Exchange 2000 SP3 and the Relay protaction is fine as far as I can see! The problem is that that the badmail foler rapidly builds up with junkmail addressed bogusmail@xxxxxxxxxxxx, nouser@xxxxxxxxxxxx, (where mydomain is the correct maildomain, but it can be anything before "mydomain.com") The problem is that the server acceppts mail for users/mailboxes that don't exist during the session and then wants to send an NDR. This however results in loads of NDR's in the BadMail folder. Is there any way of forcing Exchange to reject mail during the session for users/mailboxes that dont exist on the system? Many thanks in advance!