Personally I would also rethink the email approach too - why not load a util on there that would allow your routers to make secure DNS A record updates on a DNS server that you run yourself (and probably run on a non-standard port to avoid any other ISP interactions)...in effect becoming your own personal DynDNS service. Then, you have a name server that can always resolve the names of your routers to IP addresses.
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-Scott
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