Hi, we have a sbs 2008 server with exchange 2007 included (and running well). We use MX records instead of pop'ing our mail. My question is, in exchange 2003 you could specify where / whose mailbox (if any) got the undeliverable / wrongly addressed mail etc. How do I do this in exchange 2007 ? Thank you.

http://www.exchangeninjas.com/TransportFAQs Q: In Exchange 2003 you were able to send all mail with unresolved recipients to a specified host. How do you do the same in 2007? A: It’s the same as a non-authoritative domain. Simply specify the domain as internal relay, and configure a Send Connector to forward mail for that domain to a smart host. See: http://technet.microsoft.com/en-us/library/aa996910.aspx Q: How can I set up a catch-all with Exchange 2007? I'd like all mail to a particular domain to be directed to a single mailbox. In addition, how can you set Exchange 2007 to forward mail to an unrecognized recipient in a domain to a mailbox? (For example, bob@example.com has a mailbox, so mail will go there, but jen@example.com is not a mailbox, so I want it to go to a catchall mailbox like catchall@example.com). I think it can be done with Hub Transport Rules at Organization level but I can't figure it out for the life of me. Anyone can solve this please? A: There is not a simple way to do exactly this using Hub Transport rules. But you can make sure that a copy of every 5.1.1 DSN (invalid recipient) gets sent to a particular user. You can also suppress 5.1.1 DSNs. You can also forward unresolved messages to another host. Or you can write a transport agent to do this (which would need to run before recipient filtering). Be warned that catch all mailboxes are dangerous in this day and age because you are opening yourself to a DOS attack.