Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
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.
sSMTP - sSMTP is a simple MTA to deliver mail from a computer to a mail server.
Roundcube - Web-based IMAP email client
Sendmail - Sendmail is a general purpose internetwork email routing facility that supports many kinds of...
Cyrus IMAP - The Cyrus IMAP server differs from other IMAP server implementations in that it is generally...