Configure email routing based on sender email address

We had a request for one of our customers that have an MS Exchange 2007 hosting infrastructure about configuring the users from one hosted domain to send their emails via a certain smart host. If you haven’t tried that yet, you will say: “it’s simple, we create a transport rule and it will work”. When you will start the configuration of the transport rule you will see that there are no options regarding the connector that a certain rule should use.

Making some research, I found out that you can create your own routing agent that will take care of this. It involves a little programing skills but it’s doable. I recommend you to read the following articles:

http://blogs.technet.com/appssrv/archive/2009/08/26/how-to-control-routing-from-your-own-routing-agent.aspx

http://technet.microsoft.com/en-us/library/bb125012.aspx

http://www.microsoft.com/downloads/details.aspx?FamilyID=6eb8c09a-6ea4-442a-9faa-de33265ceb84&displaylang=en