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Stalwart Mail Server

Modern all-in-one mail server in a single binary

Mail Servers ★ 14.1k stars Medium setup AGPL-3.0

Stalwart is a modern, secure mail server written in Rust that combines JMAP, IMAP, and SMTP into a single binary. It includes built-in spam filtering, encryption, and a web admin interface.

Official siteSource code

Key features

  • JMAP, IMAP and SMTP in one binary
  • Built-in spam and phishing filtering
  • Web-based admin interface
  • Multiple storage backends

Pros & cons

Strengths

  • Single modern binary
  • Strong security defaults

Trade-offs

  • Younger than legacy stacks
  • JMAP ecosystem still small

Stalwart Mail Server replaces

Self-hosted Microsoft Exchange alternativesSelf-hosted Google Workspace alternatives

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