Stalwart
stalwartlabs/stalwart
All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV).
From the README
Stalwart is an open-source mail & collaboration server with JMAP, IMAP4, POP3, SMTP, CalDAV, CardDAV and WebDAV support and a wide range of modern features. It is written in Rust and designed to be secure, fast, robust and scalable.
- Stars
- ★ 14.8k
- Language
- Rust
- License
- AGPL-3.0
- Last updated
- 2026-09-21
- Category
- Email & marketing
- Section
- 🌏 Going global
