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Stalwartdocker-mailserver
Free

Free and open source, self-hosted.

 Free

Free and open source.

Linux, Self-hosted Linux, Self-hosted
  • Modern JMAP support alongside traditional IMAP and SMTP protocols
  • Rust implementation aims for security and performance
  • Whole mail stack in one container
  • Built-in antispam and antivirus
  • Requires self-hosting and server administration knowledge
  • Newer project with a smaller ecosystem than long-established mail servers
  • No webmail or graphical admin interface
  • Needs Docker and DNS knowledge to run well
Self-hosted Self-hosted
Open source Open source
License not stated License not stated
Not stated if an account is needed No account needed
Not stated if it works offline Not stated if it works offline

Checked September 22, 2026

Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.