Alternatives to Courier IMAP for all platforms with any license

  • 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...

    Free Open Source Mac Linux

    Dovecot icon
  • 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 Linux

    Cyrus IMAP icon
  • 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 Linux

    DBMail icon

Platforms

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