I am asking this question again -
1 have 2 Exchange servers in a colo facility. Each one is a standalone AD domain controller I am unable to send email from exchange.domain1.com to ecxhange.domain2.com - I have tried using external public DNS for this and it didn't work. So I created DNS zones on each server for the other domain and added MX records - both with internal IP addresses on the same LAN - No dice - Attached is a picture of the scenario. I don't get why the server at domain1.com can't just send out to the internet to the server at domain2.com via public DNS address but I suspect it has to do with the handshake and the fact that the servers are both behind the Cisco firewall - Maybe there is a way to do this by creating connectors. If someone could help me with this I'd really appreciate it.
Cisco pix is configuret to do PAT to either server - mail flows to and from each domain from any other mail domain.