Hi,

I have our production exchange server running exchange 2010 on domain
A. I also have a testing exchange 2007 server on domain B that we use
for development testing. I am having issues receiving mail from the
exchange 2010 users, to the test users on the exchange 2007 server. I
have assigned an external domain to the testing environment, and I am
able to send and receive mail from the outside... i.e. gmail to
testing environment.

I have created a local dns record on domain A pointing to the local IP
address of the exchange 2007 server on domain B. mail.domainB.com

I can telnet the exchange 2007 server from the exchange 2010 server.

It's gotta be something simple, I just can't figure it out. Can
someone please help!?