Hi
We have a 2010 Running all Roles and its working Fine
We installed 2 MB server 2013 and 2 Cas server 2013
All receive connectors are set up with TLS and Exchange server authentication.
I have spent countless nights trying to get the mail flow working ,
As of now mail flow from 2010 to 2013 and vice versa is not working
I have installed the Certificate on both Cas Servers but for some reason the Auto-discovery for the new CAS is still coming up as Self -singed .
I believe a have mix of small issues
I'm hoping someone can give me a push in the right direction as where to look ..