hMailServer provides all of the important functionality you need to run your own e-mail server. As a user of hMailServer, you get continuous updates and great support from other users and developers in the forum.
hMailServer is a free and open source product. Free when it comes to the price, and free when it comes to how you can use or distribute it. hMailServer supports the open email standards POP3, SMTP and IMAP4. This makes the server compatible with most email clients available.