Easiest way would be Google Apps for domains, you just enter DNS settings on your domain to use it: https://www.google.com/a/ https://www.google.com/a/ They h

Easiest way would be Google Apps for domains, you just enter DNS settings on your domain to use it: https://www.google.com/a/ https://www.google.com/a/ They have setup instructions for most domains providers. Once you've got that ready you can change at any time to another service or your own mail server by changing the DNS settings.