Buying a domain means that you own the domain you bought, but you need to have a web server that will handle your domain's email. Usually a domain's email service is bundled with the domain's web hosting service.
As mashahood_niz has mentioned, we offer domain email service as an add-on to our own web hosting packages. More information can be found on this page:
Web Hosting http://www.dynadot.com/web_hosting/about.html