Hello, I have a question concerning an ndr. Whenever an outside user sends an email to a full mailbox of a company user, this outside user receives a message. "This message could not be delivered". Is there a possibility to notify the outside user, that his message could not be delivered, because the company users mailbox was full? When we send a copy of notification messages to an inside administration emailadres. The message "mailbox is full" is correctly received. Can anyone tell me if this is possible? Thanks, Best Regards, Joris

On exchange 07, yes http://exchangedeepthoughts.blogspot.com/2008/02/custom-dsns-on-exchange-2007.html On exchange 03/00, i think you can do it with 3rd party products.