this should help you out... http://www.doteasy.com/web-hosting-a...ur-website.cfm
You can have as many domains as you like as long as they all resolve to one site. Try to use 301 redirects.. search engines don't index your email server so it does not matter where the emails go to.. You can add paragraphs that explains what you're doing in your "About Us", "Contact Us" or "Terms of Use" page to avoid confusing your users..