For all intents and purposes, let's say my Exchange server is "MAIL"
My internal network domain is 123capital.com, although it is taken by another organization, so my external network domain that we purchased is 123cap.com.
Therefore, internally our Exchange server is MAIL.123capital.com (internally) and MAIL.123cap.com (externally).
The problem is, I had applied for the UCC SSL Cert but can only be approved for the domain we currently own, which is 123cap.com and sent for approval to the owner of 123capital.com which most likely will get rejected.
How can I accomodate for my internal users in my internal 123capital domain so that when they connect to their Exchange email via Outlook that they won't be prompted with a Certificate mismatch everytime they log onto Outlook?