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Stalwart Mail Server is an open-source mail server solution with JMAP, IMAP4, and SMTP support and a wide range of modern features. It is written in Rust and designed to be secure, fast, robust and scalable. Key features: - JMAP server - IMAP4 server - SMTP server - Flexible: LDAP directory ... [More] and SQL database authentication, Full-text search available in 17 languages, Integration with OpenTelemetry to enable monitoring, tracing, and performance analysis. - Secure: Encryption at rest with S/MIME or OpenPGP, OAuth 2.0 authorization code and device authorization flows, Access Control Lists (ACLs), Rate limiting. - Robust and scalable: FoundationDB or SQLite database backends, S3-compatible blob storage support, Memory safe (thanks to Rust). [Less]

modern full-featured open source secure mail server for low-maintenance self-hosted email