I have two internet connections for redundancy: 1 cable, 1 dsl. I also have a 3rd party hosting company. I would like to configure my connection so that minimally if my dsl connection is down (static ip), I can use the 3rd party hosting company to collect my emails and also display a basic web-site indicating our site is currently being worked on. I was thinking about running a secondary dns server on the 3rd party host with mx & a records for their server, and a primary dns server at our office with records pointing to our site in house? Not sure if the two dns would conflict as it would be for the same domain. I realize that the TTL would probably have to be 0.