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Self-hosted Communication - Email - Mail Delivery Agents software (2026)

[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.

3 open-source apps · all free & self-hostable

Cyrus IMAP source

Email (IMAP/POP3), contacts and calendar server.

BSD-3-Clause-AttributionC

DavMail source

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.

GPL-2.0Java

Dovecot source

IMAP and POP3 server written primarily with security in mind.

MIT/LGPL-2.1C/deb