Exchange 2007 Cannot Send Externally

[LWComputingMVP]

Original Environment:
2 DCs both 2003 R2 SP2
1 Server 20003 R2 SP2 with Exchange 2003 SP2

Added Server 2008 Enterprise, which I then installed Exchange 2007 Enterprise on. Everything seemed to work well, no errors. Setup completed. I moved my mailbox to the 2007 server. Then I tested - I could send from external accounts and recieve - no problem. But when I tried to send from my internal account to gmail, yahoo, and a private domain I own on an ISP server, the messages are not received.

I'm not really sure what to look for here and any help would be appreciated.

 

[LWComputingMVP]

Ok, it appears it's limited to mailboxes on the Exchange 2007 server. When I moved my mailbox back to the Exchange 2003 server, I am able to send and receive again.

Is this a connector issue between the two exchanges? If so, does anyone know any step-by-step (1. Do this. 2. Do that) links that can explain how to resolve this?

Thanks.

 

[LWComputingMVP]

GOT IT!

The answer was:

http://www.exchangeinbox.com/article.aspx?i=86

Specifically under
SMTP Connector - Controlling Email Flow