Cyrus IMAP
Cyrus IMAP serves as a robust email, contacts, and calendar server, renowned for its speed and security. It supports CardDAV and CalDAV, along with extensive authentication options through Cyrus SASL. Ideal for large installations, it features efficient data storage, flexible filtering via Sieve, and deliverability handling with SPF, DKIM, and DMARC.
Top Cyrus IMAP Alternatives
Citadel
Citadel is an innovative platform that enables seamless email, collaboration, groupware, and content management tailored for both local hardware and cloud environments.
OpenSMTPD
OpenSMTPD 7.6, released on October 13, 2024, is a robust, free implementation of the server-side SMTP protocol, adhering to RFC 5321 with added standard extensions.
Mailu
Mailu offers a robust mail server solution through a collection of Docker images, emphasizing simplicity and user-centric features.
Modoboa
Modoboa empowers users to establish their own secure email servers in under 10 minutes, eliminating reliance on conventional providers.
iRedMail
Deploying a full-featured, open-source mail server takes mere minutes with this solution, which integrates essential components and best practices.
Eudora Internet Mail Server
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mailcow
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Haraka
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Mercury Mail Transport System
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Mailtraq
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Dovecot
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hMailServer
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Top Cyrus IMAP Features
- Speed optimization for email delivery
- Enhanced security protocols
- Efficient resource utilization
- Advanced search capabilities
- CardDAV support for contacts
- CalDAV support for calendars
- Robust data storage solutions
- Replication for data redundancy
- Scalability for large installations
- Flexible Sieve filtering options
- Integration with antivirus toolkits
- Comprehensive antispam tools
- SPF
- DKIM
- DMARC compliance
- Extensive authentication mechanisms
- Cyrus SASL integration
- JMAP support for JSON APIs
- Long list of supported standards
- Active community support
- Free and open source
- Continuous development since 1993.
