Currently we a have domain name with example.com and I have setup of exchange server 2007 under example.org. Is there a way I can route all example.com e-mail go to .org domain? I alsolike to block any external users using the company account to send e-mail. Are there any option in exchange 2007 server to configure it? Many Thanks

Transport rules are quite powerfull, they might help you on the way.

Thank you, I will explore transport options.