Cyrus IMAP
Email (IMAP/POP3), contacts and calendar server.
- Email Servers
- C
- BSD-3-Clause-Attribution
- Actively maintained
GitHub stats
- GitHub stars
- 652
- Forks
- 173
- Open issues
- 238
- Commits, last 12 months
- 2,494
- Last commit
- Oct 5, 2026
- Latest release
- cyrus-imapd-3.12.4Sep 9, 2026
- Created
- May 18, 2016
Data from the GitHub API, refreshed daily.
About Cyrus IMAP
Email (IMAP/POP3), contacts and calendar server. Cyrus IMAP is open source under the BSD-3-Clause-Attribution license and written mainly in C, so you can read the code, run it on your own hardware and keep full control of your data.
The project has 652 stars and 173 forks on GitHub, with 2,494 commits over the last year. It installs natively rather than through an official Docker image, so plan for a short manual setup.
Repository preview
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What is Cyrus IMAP?
Cyrus IMAP is a free, open-source app you can host on your own server, listed in our Email Servers category. Email (IMAP/POP3), contacts and calendar server. The source code lives at github.com/cyrusimap/cyrus-imapd, where it has 652 stars.
Is Cyrus IMAP free and open source?
Yes. Cyrus IMAP is open-source software released under the BSD-3-Clause-Attribution license, so you can self-host it at no cost. You only pay for the server it runs on, and some projects also offer an optional paid cloud plan.
Can I run Cyrus IMAP with Docker?
Cyrus IMAP does not list an official Docker image. It installs natively (C), so follow the install steps in its README or look for a community-maintained container.
What are the best alternatives to Cyrus IMAP?
Popular open-source alternatives to Cyrus IMAP include docker-mailserver, Postal and Mail-in-a-Box.
Is Cyrus IMAP actively maintained?
The most recent commit to Cyrus IMAP was on Oct 5, 2026 with 2,494 commits in the past twelve months. The latest release is cyrus-imapd-3.12.4, published Sep 9, 2026. Check the open issues on GitHub to gauge how quickly maintainers respond.