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hMail Server - hMailServer is a free e-mail server for Microsoft Windows.
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.
Postfix - Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
Roundcube - Web-based IMAP email client
PowerMTA - PowerMTA is an industrial-strength software for high-volume email delivery.
Microsoft Exchange Server - Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.