Forgive me for my ignorance but I don't know enough to even search for relevant posts... I have a Cisco 2811 router. I have a T1 and a Cable Internet connection. I want to be able to configure the router to answer incoming SMTP traffic from either WAN interface in the event one goes down. I've configured my MX records to point to both addresses but according to my reseller, this router can be configured to do this but the configuration is complicated and is not recommended. They said it can handle outgoing redundancy but not incoming... Can this be done? What is the best way to configure my network to handle redundant incoming connections?