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Why not just remove the DMZ nic and set up a rule on your firewall to forward requests to your internal Exchange NIC. Otherwise you could set up a SMTP server on the DMZ and create firewall rules for that and the Exchange box to be allowed to pass info only to each other?
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Why not just remove the DMZ nic and set up a rule on your firewall to forward requests to your internal Exchange NIC. Otherwise you could set up a SMTP server on the DMZ and create firewall rules for that and the Exchange box to be allowed to pass info only to each other?

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I have an Exchange 2003 server nic on internal the other nic on external DMZ my inbound e-mail comes to External nic I want me outbound e-mail to use the same but it uses my Internal nic to send outbound? My external nic is my SMTP server with class c IP.
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I have an Exchange 2003 server nic on internal the other nic on external DMZ my inbound e-mail comes to External nic I want me outbound e-mail to use the same but it uses my Internal nic to send outbound? My external nic is my SMTP server with class c IP.

configuring outbound IP

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.