Many Thanks Running an email server on dynamic DNS, while certainly possible, is a bad idea.
Here's why: If you don't want to get a static IP, then I'd suggest checking into the various email hosting services (google for "email hosting") and see if one of those might fit your needs.
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Easiest setup I suppose is dyndns which has clients for all major OS's.
I have tried Google Apps Mail but it doesn't allow auto cc of outgoing emails.
After having read tons of blogs, forum messages etc (hope I have been reading the correct info :) ) the only option to achieve what I am needing is to setup my own mail server, but the cost of getting a static IP doesn't fit my budget.
As far as the email server aspect, your biggest issue on dynamic DNS will be other email servers marking the mail as spam due to the changing nature and tough identity of a server running on a dynamic DNS.
Many email providers, gmail for instance, will mark my emails as spam because it cannot identify the credibility of my server.