Hi,
I am currently migrating existing Exchange 2010 to Exchange 2013. So far, I have successfully installed Exchange 2013. I can also migrate users to and from exchange 2013. But the problem is, User on Exchange 2013 can received emails from Exchange 2010, however, emails sent from Exchange 2013 are stuck in queue and not delivering to Exchange 2010 users.
This could be worth mentioning that I have a multiple AD sites. Exchange 2010 was deployed in site ABC whereas, I deployed Exchange 2013 in Site XYZ which was a requirement. The same can be seen in the screenshot below:-
What could be the problem with mail flow as I mentioned earlier? Can it be the problem due to different site?
Thanks.