Its very possible, there are several free mail servers available, just google for them. I haven't used any to know which are best.

In this article I'll talk about the hardware and software components you'll need to build an e-mail system based on either Microsoft Exchange Server 2003 or an Open Systems e-mail server such as ...

At Cedars-Sinai Medical Center in Los Angeles, e-mail is an integral part of both hospital operations and patient care. The hospital relies on e-mail to transmit patient test results to doctors, ...