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It is possible that all the traffic that pass through the port 25, goes by the same WAN interface?

My router is http://www.tp-link.us/products/details/?categoryid=&model=TL-R470T%2b

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up vote 3 down vote accepted

Yes, it's possible! Just go to admin interface and Advanced -> Load Balance -> Policy Routing. Create a policy with the destination port 25 and select the interface that you want the packets leave.

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