troubleshooting Question

Cisco Pix problem or Microsoft Exchange? Can email anybody except the one domain that sits behind the same firewall as I

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pflecha asked on
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I have 2 domains with separate IP subnets (192.168.1.X and 192.168.5.X)  Both have their own Exchange 2003 mail servers.

I have a Cisco PIX T515 with an interface for each network.  Gateway for 1.X = 1.1 gateway for 5.X = 5.1

-My Exchange server 2003 users on the 1.X  have no problems emailing anybody in the world including recipients on the 5.X network.

-My Exchange Server 2003  users on the 5.X can email anybody in the world EXCEPT users in my 1.X domain.

Is this an Exchange DNS problem or a PIX routing issue?

My 5.X users need to be able to email the 1.X users.

Please advise.
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