Open Source
Stalwart
by stalwartlabs
All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).
Our verdict
We have not reviewed Stalwart yet
No one at Enterprise DNA has checked this listing against its sources. The description comes from public listings gathered automatically. Any fact below shows where it came from and when it was last checked.
From the listing
About Stalwart
Stalwart is an all-in-one mail and collaboration server written in Rust. It supports IMAP, JMAP, SMTP, CalDAV, CardDAV, and WebDAV protocols, aiming for security and scalability. The server is designed to handle email, contacts, and calendars in a single deployment.
Best for
Developers and sysadmins seeking a modern, unified mail and collaboration server.
Use cases
- Deploy a self-hosted mail server with full protocol support
- Replace multiple services (SMTP, IMAP, CalDAV) with one server
- Build a scalable collaboration platform for teams or enterprises
Notes
15,485 stars on GitHub. Last updated 2026-10-28.
Pros
- Comprehensive protocol coverage in a single binary
- Rust-based for memory safety and performance
- Active open-source project with high community traction
Cons
- Requires Rust-specific knowledge for custom extensions
- May be complex to configure for non-experts
- Younger ecosystem compared to mature mail servers like Postfix
Key facts
What we have checked
- Latest version
- 1.1.0 (released 9 Nov 2026)
- Days since the last commit
- 3
- GitHub forks
- 1,042
- GitHub stars
- 15,769
- Days to a first reply on issues
- 40.6
- Open issues
- 39
- Releases in the last 90 days
- 15
Each value shows when we last confirmed it and where it came from. Values we have not confirmed are left out, never guessed.
Stars and usage
How Stalwart is growing
15,565 to 15,769
Health and security
Is Stalwart looked after, and what do its setup files show
Health score
75 out of 100
| Part | Points | What we saw |
|---|---|---|
| Recent activity | 30 of 30 | Last push 3 days ago |
| Releases | 15 of 15 | 15 releases in 90 days |
| Issue replies | 0 of 20 | First reply in 40.6 days (median) |
| Maintainer | 15 of 15 | Owned by an organisation |
| Official source | Not counted | MCP servers only |
Alternatives
Alternatives to Stalwart
| Record | Type | How we know | Checked |
|---|---|---|---|
| GmailThis is an alternative to it | Product | Linked recordGitHub |
Compare
Compare Stalwart side by side
Sources
Where this comes from
A source shows what was published when we checked it. It does not certify security, performance or a working installation. Read our method.
Changelog
What changed
Released 1.1.0
Released 1.0.3
Released 1.0.2
Released 1.0.1
Released 1.0.0
Released 0.16.27
Released 0.16.26
Released 0.16.25
Released 0.16.24
Released 0.16.23
Released 0.16.22
Released 0.16.21
Released 0.16.20
Released 0.16.19
Released 0.16.18
Open-source & AI alternatives
Swap-in tools that solve the same job. Weigh the trade-offs before you commit.
Get the free Developer’s Field Guide
A 27-page field guide to the AI coding workflow with Claude. Claude Code, MCP servers, the prompt patterns that work, and what to delegate. Free.
Enter your work email. We send it straight over, plus a few short notes worth knowing. Unsubscribe any time.