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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.
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Roundcube - Web-based IMAP email client
Cyrus IMAP - The Cyrus IMAP server differs from other IMAP server implementations in that it is generally...
DBMail - DBMail is a fast, scalable IMAP4 and POP3 server that stores all email and users in a Postgresql...
Microsoft Exchange Server - Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.