Freedom251 › Mail Server Software
Cyrus IMAP
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Cyrus IMAP | Free and open source server software | Free |
As cyrusimap.org lists them, read 3 Oct 2026. The maker's own page has the final word.
Facts from Cyrus IMAP's own pages
- Antivirus and antispam
- The project says Cyrus supports antivirus and antispam toolkits. · cyrusimap.org, 3 Oct 2026
- Authentication
- Cyrus uses Cyrus SASL and supports multiple authentication options. · cyrusimap.org, 3 Oct 2026
- 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. · cyrusimap.org, 3 Oct 2026
- Filtering
- It supports server-side email filtering through Sieve. · cyrusimap.org, 3 Oct 2026
- Founded
- 1993 · cyrusimap.org, 28 Sept 2026
- Integrations
- The installation guide describes receiving mail from SMTP servers such as Sendmail, Postfix, and Exim through LMTP. · cyrusimap.org, 3 Oct 2026
- Intended users
- The project says Cyrus is used in production at universities and private enterprises. · cyrusimap.org, 3 Oct 2026
- Mail delivery
- It supports email deliverability features including SPF, DKIM, and DMARC. · cyrusimap.org, 3 Oct 2026
- Open source
- The project describes Cyrus as free and open source. · cyrusimap.org, 3 Oct 2026
- Protocols
- Cyrus supports JMAP, IMAP, POP3, CalDAV, and CardDAV. · cyrusimap.org, 3 Oct 2026
- Purpose
- Cyrus IMAP is an email, contacts, and calendar server. · cyrusimap.org, 3 Oct 2026
- Scale and reliability
- The project lists replication, robust data storage, and scalability for large installations among its features. · cyrusimap.org, 3 Oct 2026
- Security
- The feature documentation lists Kerberos, LDAP, and SQL authentication, access control, and a sealed system design. · cyrusimap.org, 3 Oct 2026
- Support
- The project points users to active mailing lists for help. · cyrusimap.org, 3 Oct 2026
Where Cyrus IMAP stands on Freedom251
- Mail Server Software#9 of 34