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configuring outbound IP

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.
1 Solution
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?
following is the cut and paste from "configuring the SMTP in exchange guide". hope this helps you

The basic configuration consists of a mail gateway configured with two network interfaces; this gateway acts as the single connection point between your intranet and the Internet.
The following lists provide general configuration requirements for the two virtual servers and the SMTP connector: Note If you configure two virtual servers on a single Exchange server, be sure to use a unique combination of IP addresses and ports. Do not configure either virtual server to use the default value of all available IP addresses.

Virtual server 1 −
Configure virtual server 1 as the bridgehead server for the SMTP connector. − Configure virtual server 1 to use external Domain Name System (DNS) servers, through the external DNS server list. − Bind virtual server 1 to an intranet IP address on port 25. − Enter the local company domain (for example, winery_co.co).

Virtual server 2 −
Configure virtual server 2 so it does not relay mail (this is the default configuration). For specific instructions, see “Verifying Default Relay Restrictions on Your Inbound Virtual Server” . − Configure virtual server 2 to allow anonymous access (this is the default configuration). For specific instructions, see “Allowing Anonymous Access on the Outbound Virtual Server” . − Bind virtual server 2 to an Internet IP address on port 25. − Select the local company domain (for example, winery_co.co).

SMTP connector −
Configure the SMTP connectors to use DNS to route to each address space on the connector. − Home the SMTP connector to virtual server 1 by specifying it as the bridgehead server. − Create an address space of * (asterisk) or an equivalent. − Use two network interface cards (NICs)—an internal NIC and an external NIC. − Verify that there is no IP routing configuration between the two networks on your server. (This is the default configuration.) For more information about how to configure an SMTP connector, see “Configuring an SMTP Connector” .

Inbound Internet Mail Messages flow into an Exchange organization in the following manner. 1. Messages that originate from the Internet use the Internet IP address to send mail to recipients in the local domain. 2. Virtual server 2 monitors this Internet IP address for mail and receives all incoming Internet messages. Because virtual server 2 is not configured to relay mail, it rejects mail that is not directed to the company’s domain (for example, winery-co.co). 3. When virtual server 2 receives a message from the Internet that is intended for a host inside the local domain, it contacts Active Directory through the internal NIC to determine where to send the message. Therefore, messages received by virtual server 2 are sent directly to the internal host. Note Although virtual server 2 monitors an external IP address for incoming mail, it uses whatever IP address is appropriate for routing messages, based on the entries in the routing table. Virtual server 2 uses only internal DNS services for name resolution. Virtual server 2 is not configured with an external list of DNS servers, so it does not resolve external addresses. It rejects all messages with addresses to a domain other than the company’s domain (in this case, winery-co.co).
 Outbound Internet Mail Mail flows out of an Exchange organization in the following manner. 1. A user sends a message to an external recipient. 2. Because this message is outbound, it uses the SMTP connector homed on virtual server 1. 3. When virtual server 1 receives a message for a remote domain, it uses the list of external DNS servers to find the IP address of the message recipient, and then uses the external NIC to deliver the external mail. (Generally, external Internet IP addresses are not available on an internal DNS server.) Important Although virtual server 1 is configured to monitor the intranet IP address, it uses the Internet NIC for external mail.

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