Stalwart JMAP

Stalwart JMAP: A Secure, Fast, and Scalable Email Server

Stalwart JMAP is an open-source JSON Meta Application Protocol (JMAP) server designed to be secure, fast, robust, and scalable. As a modern protocol for synchronizing data such as mail, calendars, or contacts, JMAP makes much more efficient use of network resources.

Main Features:

Security and Robustness:

• Encryption at rest with S/IMIME or OpenPGP
• Built-in Spam and Phishing filter
• OAuth 2.0 authorization code and device authorization flows
• Access Control Lists (ACLs)
• Rate limiting

Scalability and Flexibility:

• Pluggable storage backends with support for RocksDB, FoundationDB, PostgreSQL, MySQL, SQLite, S3- Compatible, Redis, and ElasticSearch
• Internal, LDAP, and SQL database authentication
• Built-in SMTP server for local delivery and JMAP Email Submissions
• Full-text search available in 17 languages
• Disk quotas
• Sieve scripting language with support for all registered extensions
• Email aliases, mailing lists, subaddressing, and catch-all addresses support

Compliance:

• JMAP Core (RFC 8620)
• JMAP Mail (RFC 8621)
• JMAP over WebSocket (RFC 8887)
• JMAP for Sieve Scripts (DRAFT-SIEVE-13)

Stalwart JMAP is designed to be a reliable and secure email server that can handle large volumes of users while providing advanced features and compliance with industry standards.