Cyrus IMAP
cyrusimap.org
Spec sheet
- Purpose
- Cyrus IMAP is an email, contacts, and calendar server.Read 3 Oct 2026 · cyrusimap.org
- Intended users
- The project says Cyrus is used in production at universities and private enterprises.Read 3 Oct 2026 · cyrusimap.org
- Integrations
- The installation guide describes receiving mail from SMTP servers such as Sendmail, Postfix, and Exim through LMTP.Read 3 Oct 2026 · cyrusimap.org
- Security
- The feature documentation lists Kerberos, LDAP, and SQL authentication, access control, and a sealed system design.Read 3 Oct 2026 · cyrusimap.org
- Support
- The project points users to active mailing lists for help.Read 3 Oct 2026 · cyrusimap.org
- Founded
- 1993Read 28 Sep 2026 · cyrusimap.org
- Antivirus and antispam
- The project says Cyrus supports antivirus and antispam toolkits.Read 3 Oct 2026 · cyrusimap.org
- Authentication
- Cyrus uses Cyrus SASL and supports multiple authentication options.Read 3 Oct 2026 · cyrusimap.org
- Download
- Cyrus is available as source tarballs or source from Git, and as packages for major distributions; distribution packages may not be up to date.Read 3 Oct 2026 · cyrusimap.org
- Filtering
- It supports server-side email filtering through Sieve.Read 3 Oct 2026 · cyrusimap.org
- Mail delivery
- It supports email deliverability features including SPF, DKIM, and DMARC.Read 3 Oct 2026 · cyrusimap.org
- Open source
- The project describes Cyrus as free and open source.Read 3 Oct 2026 · cyrusimap.org
- Protocols
- Cyrus supports JMAP, IMAP, POP3, CalDAV, and CardDAV.Read 3 Oct 2026 · cyrusimap.org
- Scale and reliability
- The project lists replication, robust data storage, and scalability for large installations among its features.Read 3 Oct 2026 · cyrusimap.org
Plans and prices
Cyrus IMAP Free Free and open source server software Read 3 Oct 2026 · cyrusimap.org
Where Specifiction places it
- Mail Server Software#16 of 347.9
