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Stalwart

All-in-one Mail & Collaboration server

File Sync & Storage ★ 14.1k stars Easy setup free

📧 Stalwart is a fast, secure, and scalable open-source server for email, calendars, contacts, and file sharing, built in Rust for top-tier performance and safety. All-in-One Communication Platform - Full Email Protocol Support: JMAP, IMAP4, POP3, and SMTP with advanced authentication, security, and filtering. - Collaboration Tools: CalDAV calendars, CardDAV contacts, WebDAV file storage and sharing. - Spam & Phishing Protection: AI-powered filtering, DNS blocklists, greylisting, sender reputation tracking, and more. Powerful Features for Any Scale - Flexible storage backends: PostgreSQL, MySQL.

Official siteSource code

Strengths

  • Easy to set up — beginner-friendly
  • First-class Docker support for quick deployment
  • One-click install on common self-host platforms
  • Mature project with 14.1k GitHub stars

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