Exchange 2013 with latest CU
Hybrid configuration with Exchange Online
I've added to a new domain to my list of accepted domain (internet relay) sub.maindomain.org and now I trying to create a new Email Address Policy to applied the new domain to a Recipient Containers.
When I get to the point in saving the new domain to "Email Address Format" within the Email Address Policies, the "Email Address Format" box only shows SMTP. When I open "Email Address Format" it reverted back to my forest domain. I tried all different options that's available to add the new domain to a Email Address Policies for the new domain and all failed to save.