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Update/Edit:
I've thought about it a bit more. I think I can explain better what I'm looking for.

I need a method of maintaining communication with my Server regardless of it's method of internet connection. If we need to move the server (i.e. to a hotel in case of an emergency), I need it to be able to receive email and be accessible to clients (when they want to check their email). I need to know how I can set up my domain registration to always know where my email server is no matter "where" my email server is (even if its in the same room, just using a backup form of internet connection). Currently we have a static IP (from AT&T) that I have assigned to our registrar for our mx.domain.com address. I need to make sure that I have something assigned to my registrar that will always communicate with my email server, and not just when it's using that static IP.

The RRA isn't as big of a problem anymore. If we are going to use a backup form of internet connection (like dial up or wireless 3G) then I don't necessarily want users to be using that connection. So I am going to use whatever form of backup internet service I can get my hands on. All I need to know is how to guarantee communication between my server and the registrar so it will always receive email (and allow access to whoever will use OWA).

This is really important, so any ideas or comments are welcome.

Thanks!

-Tim