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I recall some home routers having the ability to ping a DNS service any time your IP changes. Can't recall the name or router compatibility but might solve the dynamic ip issue.

One which used to be free, but is not anymore, is DynDns.

Run a search for "dynamic dns" and you will find a bunch of providers.

Hosting your own email works best with a static IP, but you can "get by" with a dynamic due to the store-and-forward nature of the protocol.

You can probably use a service like zzzz.io or DynaDNS. This will eliminate the need for static IP. No?

issue is less the ip address then it is the need for special MX dns records, which most of those services don't let you set up

Very true, but some dynamic dns providers do allow MX records.

A list of them is here (found via search, no suggestion of "goodness"): http://www.gnutomorrow.com/best-free-dynamic-dns-services-in...