Cyrus IMAP

The Cyrus IMAP server differs from other IMAP server implementations in that it is generally intended to be run on sealed servers, where normal users cannot log in.

Free
Open Source
Mac OS X
Linux

The Cyrus IMAP server differs from other IMAP server implementations in that it is generally intended to be run on sealed servers, where normal users cannot log in. Users can access mail through the IMAP/IMAPS, POP3/POP3S or KPOP protocols. The private mailbox database design gives the server considerable advantages in efficiency, scalability, and administratability.

Links to official Cyrus IMAP sites

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The Best 5 Cyrus IMAP Alternatives

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Dovecot

Dovecot is an open source IMAP and POP3 email server for Linux/UNIX-like systems, written with security primarily in mind. Dovecot is an excellent choice for both small and large installations.

Free Open Source Mac OS X Linux

POP3 Support Support for SFTP
3 Like

Courier IMAP

The Courier IMAP server is a fast, scalable, enterprise IMAP server that uses Maildirs. Many E-mail service providers use the Courier IMAP server to easy handle hundreds...

Free Open Source Mac OS X Linux BSD Self-Hosted
1 Like

Archiveopteryx

Archiveopteryx stores email in a database and provides access to it through IMAP and more.

Free Open Source Mac OS X Linux BSD
1 Like

DBMail

DBMail is a fast, scalable IMAP4 and POP3 server that stores all email and users in a Postgresql, MySQL or SQLite database.

Free Open Source Mac OS X Windows Linux

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Cyrus IMAP

Links to official Cyrus IMAP sites

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The Best 5 Cyrus IMAP Alternatives

Dovecot

Courier IMAP

Archiveopteryx

DBMail

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