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SpamAssassin - Use this program to "Unspam" your mailbox(es).
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.
MailScanner - MailScanner is a open source email security system design for Linux-based email gateways.
Roundcube - Web-based IMAP email client
Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...
Microsoft Exchange Server - Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.