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

the courier imap server is a fast, scalable, enterprise imap server that uses maildirs. many email service providers use the courier imap server to easy handle hundreds of thousands of mail accounts. with its builtin imap and pop3 aggregation proxy, the courier imap server has practically infinite horizontal scalability. in a proxy configuration, a pool of courier servers service initial imap and pop3 connections from clients. they wait to receive the client's log in request, look up the server that actually holds this mail account's mailbox, and establish a proxy connection to the server, all in a single, seamless process. mail accounts can be moved between different servers, to achieve optimum resource usage.

Links to official Courier IMAP sites

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The Best 5 Courier 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
5 Like

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
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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Courier IMAP

Links to official Courier IMAP sites

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The Best 5 Courier IMAP Alternatives

Dovecot

Cyrus IMAP

Archiveopteryx

DBMail

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