How to: Communication - Email - Mail Delivery Agents
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[Mail Delivery Agents](https://en.wikipedia.org/wiki/Message_delivery_agent) (MDAs) - [IMAP](https://en.wikipedia.org/wiki/Internet_Message_Access_Protocol)/[POP3](https://en.wikipedia.org/wiki/Post_Office_Protocol) server software.

- [Cyrus IMAP](https://www.cyrusimap.org/) - Email (IMAP/POP3), contacts and calendar server. ([Source Code](https://github.com/cyrusimap/cyrus-imapd)) `BSD-3-Clause-Attribution` `C`
- [DavMail](https://davmail.sourceforge.net/) `⚠` - POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client with an Exchange server, even from the internet or behind a firewall through Outlook Web Access. ([Source Code](https://github.com/mguessan/davmail)) `GPL-2.0` `Java`
- [Dovecot](https://www.dovecot.org/) - IMAP and POP3 server written primarily with security in mind. ([Source Code](https://github.com/dovecot/core)) `MIT/LGPL-2.1` `C/deb`