I'm looking for a way to limit delivery to a mailbox on an Exchange server. I need to ensure that only a sender with a specific reply to address can get emails into a mailbox. I am working with Exchange 2000 and 2003, but if a solution will only work with one or the other I am still very interested in hearing it.

Hi, If the sender is internal you can configure delivery restrictions on thedesired mailbox in exchange server 2003. Leif

And if the sender is external?

You can create a contact for this external person with mail addressin the AD, then it can be added in the setting of delivery restriction