It's perfectly possible to use a dynamic IP for hosting a mail server. The only thing you should be aware of is that you may get on a blacklist and/or some mailserver refuse to accept mail from a 'domestic' or dynamic IP (most notably, it's a problem with AOL email servers). I'd suggest you investigate using a Dynamic IP hosting server which will give you a backup mail server if yours is off-line, I use easydns.com and their mail server will queue mail for up-to five days if my server is unavailable. I believe that dyndns.org also has a similar service, others may have their favourites and google should provide a good list for you.
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Regards
Bill
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