That's probably an easy one but I'm stuck and can't figure it out. So i'm calling on the real exchange guru out there. I installed exchange 2010 over the week-end to work with our exchange 2007 server. Install went well and I moved my mailbox from 2007 to 2010. Now here is the issue and it only affect my accout since I have the only mailbox on the 2010 server.
I can receive emails from internal users (Exchange 2007) and from external users. I can send emails to external users but I cannot send anything to any of the 2007 exchange users.
My messages get stuck on the queue "SMTP relay in active directory site". And the full error is: 451 4.4.0 Primary target IP address responded with: "421 4.4.2 Connection dropped due to ConnectionReset.". Attempted failover.....
I am not sure if that has to do with certificates or not. The 2007 exchange has a Valid CA certificate while exchange 2010 has a self signed certificate... I will get a valid one soon for the transition time. But i'd like to get the 2010 server to talk to the 2007