Cyrus IMAP
OPEN SRCThe complete, scalable, and open-source email, contacts, and calendar server.
Product Details
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PROS & CONS
STRENGTHS
- Enterprise-grade scalability and reliability proven in large installations.
- Actively maintained with strong community and commercial support.
- Extremely scalable and proven in large, demanding environments.
WEAKNESSES
- −Lacks a built-in webmail client, requiring integration with separate projects like Roundcube.
- −Steep learning curve; configuration is complex for non-experts.
KEY FEATURES
Unified Storage (Sieve)
Uses a single-store 'Sieve' backend for mail, calendar, and contact data.
Scalable Architecture
Designed for large-scale deployments with high concurrency and data volume.
High Scalability
Designed to handle massive mailboxes and high user loads efficiently.
CalDAV & CardDAV Support
Full support for calendar and contact synchronization via open standards.
WHO IS Cyrus IMAP BEST FOR?
System administrators at universities or large enterprises
They need a scalable, secure, and standards-compliant mail server to manage email, contacts, and calendars for thousands of users.
Developers and IT teams building custom email solutions
They require a robust, open-source platform with extensive protocol support (IMAP, CalDAV, CardDAV) to integrate email and scheduling into applications.
INTEGRATIONS
TECHNICAL DETAILS
✓ REST
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