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Route port traffic through specific network adapter

Last Modified: 2012-08-14
The Situation:
I have a Windows 2008 Server with Exchange 2007.  I have enabled routing and remote access.  There are three network adapters, LOCAL, DSL, and CABLE.  The goal is to have all HTTP traffic go out the CABLE adapter, while outgoing and incoming traffic over port 25 go over the DSL.  I have successfully set up NAT for the CABLE adapter.  The default gateway is set up on the CABLE adapter.

I know my way around a server, but I'm not quite sure where to look.  I thought I could configure the Exchange Send Connector to only go through one adapter instead of the default gateway, but it only allows me to route it through a specific host.  I suppose I can configure a router to handle it, but I'd rather have everything go through the server.

I'm not sure what information you need to help me with this problem, so please ask questions.  
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