I have a 2013 Exchange on prem server. The email domain for this question is firstname.lastname@example.org.
A few months back we created an email domain, email@example.com, for a business unit. This is a cloud based email hosted by a 3rd party company.
The two domains do not share any Active Directory information, and there is no A/D for test.us.com
I recently created a contact list and then transferred that file (msg file) to a user in the test.us.com.
I could open the contact list on that user's pc (Outlook 2016) but could not send an email to my test.com domain.
Any suggestion would be greatly appreciated.