Microsoft, Exchange, 2003, can't relay mail to different servers on the same LAN

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.  

cunundrum.jpg
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fredimacAsked:
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abraham808Commented:
Do you get an error message?

What do you have for exchange connectors?
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fredimacAuthor Commented:
Just the default SMTP connector on each server which accepts email from the outside - I am not sure how to create connectors to communicate between the two servers.
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fredimacAuthor Commented:
It was bad DNS
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fredimacAuthor Commented:
There was no help
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Vee_ModCommented:
Closed, 500 points refunded.
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