Self-Hosted Software Communication - Email - Mail Delivery Agents

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1. Cyrus IMAP

Email (IMAP/POP3), contacts and calendar server. ([Source Code](https://github.com/cyrusimap/cyrus-imapd )) `BSD-3-Clause-Attribution` `C`

2. Dovecot

IMAP and POP3 server written primarily with security in mind. ([Source Code](https://github.com/dovecot/core)) `MIT/LGPL-2.1` `C`

3. MailForm

Lightweight self-hosted open source alternative to Formspree and SendGrid. `Apache-2.0` `Nodejs`

4. Piler

feature-rich open source email archiving solution. ([Source Code](https://bitbucket.org/jsuto/piler)) `GPL-3.0` `C`