Forum Discussion
Newly added Exchange 2016 server in an existing Exchange 2010 hybrid setup - mail flow issues
Hi All Need some help urgently. I just added a new Exchange 2016 server to our existing Exchange 2010 Hybrid setup. For some reason the Exchange 2016 server now wants to participate in mail flow ...
I figured this out.
This article pointed me in the right direction:
https://www.petenetlive.com/KB/Article/0000791
Turns out on the Exchange 2010 server there was a receive connector for anonymous relaying that had the IP of the Exchange 2016 server and on this receive connector "Exchange Server Authentication" was unchecked.