Microsoft Exchange Server - Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.
Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
hMail Server - hMailServer is a free e-mail server for Microsoft Windows.
sSMTP - sSMTP is a simple MTA to deliver mail from a computer to a mail server.
Zimbra - Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
Sendmail - Sendmail is a general purpose internetwork email routing facility that supports many kinds of...