Stalwart is an open-source all-in-one mail and collaboration server built in Rust, offering secure, scalable support for modern protocols like JMAP, IMAP, SMTP, CalDAV, CardDAV, and WebDAV for self-hosters and organizations.

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🚀 Overview

Stalwart redefines self-hosted email and collaboration by packing MTA, IMAP/JMAP servers, spam filtering, calendars, contacts, and file storage into a single Rust binary. It's designed for high performance, memory safety, and effortless scaling from personal setups to enterprise clusters.

Traditional email infrastructure relies on stitching together outdated, insecure components like Postfix, Dovecot, and SpamAssassin, leading to complexity, vulnerabilities, and maintenance nightmares. Stalwart solves this with a unified, modern platform.

• What problem does this project solve? Fragmented email stacks lacking security, scalability, and modern features like JMAP real-time sync or AI spam detection.
• Who is it built for? Developers, sysadmins, teams, and organizations wanting privacy-focused, self-hosted comms.
• Why did you build it? To bring email into the 21st century with Rust's safety, all-in-one simplicity, and protocol fluency—backed by grants and community.

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✨ Key Features

• Comprehensive Protocol Support: JMAP, IMAP4rev1/rev2, POP3, SMTP for email; CalDAV, CardDAV, WebDAV for calendars/contacts/files (enables modern clients like Thunderbird with real-time sync).
• Enterprise-Grade Security: Encryption at rest (S/MIME, OpenPGP), ACME auto-TLS, DANE/MTA-STS, granular ACLs, rate limiting, fail2ban integration, memory-safe Rust (audited).
• Advanced Spam/Phishing Defense: LLM-driven filters, statistical classifiers, DNSBL/Pyzor, greylisting, spam traps, sender reputation, trusted replies.
• Ultimate Flexibility: Pluggable storage/search backends, enhanced Sieve scripting, dynamic config rules, multi-tenancy, quotas, aliases/mailing lists, full-text search in 17 languages.
• Web Admin Dashboard: Intuitive SPA for monitoring/config/management; observability with Prometheus/OpenTelemetry.
• Optional: Upcoming v1.0 with schema finalization and perf optimizations.

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🛠 Tech Stack

• Core & Frontend (Webadmin): Rust, Leptos web framework
• Backend: Rust (async runtime)
• Database/Storage: RocksDB, FoundationDB, PostgreSQL, MySQL, SQLite, Redis, S3, Azure Blob
• Search: Built-in, Meilisearch, Elasticsearch, OpenSearch
• Auth: OpenID Connect, OAuth 2.0, LDAP, SQL, 2FA-TOTP, app passwords
• Hosting: Self-hosted (Docker, Linux/macOS/Windows binaries), clustering with node discovery

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👥 Who Is This For?

This project is useful for:

• Developers who want to self-host a secure, modern email server without managing multiple tools
• Teams looking for integrated collaboration (email + calendars/contacts/files) with scalability
• Indie makers and organizations building sovereign comms infrastructure

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📸 Screenshots / Demo

• Live demo: No public instance (designed for self-hosting)
• GitHub: https://github.com/stalwartlabs/stalwart (screenshots: /img/ folder)
• Webadmin: https://github.com/stalwartlabs/webadmin
• Slides: https://stalw.art/slides

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🔥 Project Status

• 🟢 Actively building

Last updated: 2026-03-24

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❓ FAQ

Is this project free?

Yes / Open Source (explain: AGPLv3 for community edition; Enterprise license for commercial use via sponsorship at opencollective.com/stalwart, unlocks premium support.)

Is the source code available?

Yes — https://github.com/stalwartlabs/stalwart

Can I contribute?

Yes—browse/vote on GitHub issues (especially enhancements), submit PRs, join discussions on GitHub/Discord/Reddit. Follow CONTRIBUTING.md and code of conduct.

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📬 Contact & Links

• Website: https://stalw.art
• GitHub: https://github.com/stalwartlabs/stalwart
• Twitter/X: https://x.com/stalwartlabs
• Discord: https://discord.com/servers/stalwart-923615863037390889
• Reddit: https://www.reddit.com/r/stalwartlabs/

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