I recently began working on deploying our new 2013 Exchange server into a network I inherited. The network has two domains with a trust between them all on the same IP segment, calling them Domain1.local and Domain2.local. The Exchange server is connected to Domain1.local and I need to get users from the Domain2.local added to Exchange so everyone is getting email. To top this off our email MX comes from two external domain names, Domain1.com and Domain2.org. I will need to be able to send and receive email from those .com and .org domains and disseminate them to the two .local domains. I have looked almost everywhere to resolve these issues but I am kind of stuck right now. Any help or information leading to the right direction would be helpful, like do I need to rename the internal domains to reflect the external ones, etc... I'm really new to Exchange and went through every walk through and CBT I could find.
Thanks a bunch.