Run an SMTP and IMAP mail server with Docker Mailserver, which includes LDAP, anti-spam, and anti-virus components.
Stalwart
Stalwart provides mail and collaboration server software supporting IMAP, JMAP, SMTP, CalDAV, CardDAV, and WebDAV.
About Stalwart
Stalwart is open-source mail and collaboration server software written in Rust. It covers email, calendars, contacts and file storage, and you install it on your own server. Its official GitHub repository holds the source code for the project.
Pricing is not clearly stated.
Key features
- Email over IMAP, POP3, SMTP and JMAP
- CalDAV calendars with scheduling
- CardDAV contact management
- WebDAV file storage with sharing controls
- Built-in spam and phishing filter
- Pluggable storage backends such as PostgreSQL and S3-compatible storage
- Sieve scripts, aliases and mailing lists
- Web-based administration dashboard
Best for: People who want to run their own mail and collaboration server.
Watch out for
- Priority support requires purchasing an Enterprise License
Stalwart at a glance
- Category
- Development › Self-Hosting
- Type
- App
- Pricing
- Not confirmed. Check the site
- Platforms
- Linux, macOS, Windows
- Details verified
- Oct 21, 2026 · Official source
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Stalwart alternatives
Tools and sites you could use instead, ranked by how closely they match.
Run email, calendar, contact, and file services with Stalwart, an open-source collaboration server.
Set up an open-source mail server with iRedMail on supported Linux and BSD systems.
Deploy server, backup, and mail solutions with Proxmox open-source server products.
Set up a personal mail server with Mail-in-a-Box, an easy-to-deploy server package.
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Stalwart FAQ
Which systems can I install it on?
The install instructions cover Linux, macOS, FreeBSD, Windows and Docker.
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