We are in the process of rebranding our company. I have added a new email accepted domain to our environment to facilitate this transition. I have set the mx records of the additional domain to the primary domain and mail flows fine.
My internal AD Domain name is the same as my external domain name...ie company.com and email is @company.com
My Exchange 2013 single server certificate points to the original domain company.com, mail.company.com, audiscover.mail.company.com. I have changed the default reply to address of a couple of accounts to the new address and tested with mobile clients (Android and iPhone) with nothing but success.
I set the email address policy default domain to the new domain, comp.com, yesterday afternoon, and got no complaints until this morning. All users including my self and the test subjects I tested, were unable to send outbound mail on their phones today including a couple of iPhone users. Inbound my still flowed into mobile devices as normal. All domain joined desktops had zero problems.
The policy was the only thing that I changed. So after much deliberation I set the policy back to the original domain name and reset the ActiveSync App Pool and all was as it was before.... FUNCTIONAL
I still have my Android device, configured with ActiveSync to the original domain sending email as the new domain for reply with no problems by overriding the email address policy. Do I manually override all users and remove the @company.com address?
The management wants to stop inbound mail to the original @company.com and switch everything to @comp.com but the domain is integral to my environment.
What is the best next step? Do I need some kind of Alternate UPN addition?