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 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).
Commercial Use
Modify
Distribute
Place Warranty
Sub-License
Hold Liable
Disclose Source
Include Copyright
State Changes
Include License
Include Install Instructions
These details are provided for information only. No information here is legal advice and should not be used as such.
There are no reported vulnerabilities
30 Day SummarySep 24 2025 — Oct 24 2025
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12 Month SummaryOct 24 2024 — Oct 24 2025
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