Hi, On my old Exchange 2003 server, if an email could not be resolved it would pop it into my administrator mailbox. e.g whateveryoulike@mail.com would go to administrator. Now I'm on Exchange 2007, it just bombs back to the sender saying that the email address doesn't exist. I don't want this to happen. If the email address doesn't exist I want it to go into the admin mailbox. How do I do this?

Further to this, what was happening was the NDR was just being copied to the administrator mailbox. I cannot see on Exchange 2007 where to set this option. Anybody know?

Just use this line of code in your powershell : Set-TransportServer -Identity exchange -ExternalPostmasterAddress "postmaster@domain.com"