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Chatmail Relay

Minimal email server tuned for Delta Chat messaging

Chat & Communication ★ 488 stars Medium setup MPL-2.0

A minimal, opinionated mail server configuration optimized to act as a relay for Delta Chat clients, providing instant, encrypted messaging over standard email. It is provisioned automatically for low-maintenance operation.

Official siteSource code

Key features

  • Email-based messaging
  • Automatic provisioning
  • End-to-end encryption
  • Low maintenance

Pros & cons

Strengths

  • Uses open email standards
  • Hard to censor

Trade-offs

  • Requires mail server knowledge
  • Newer project

Is Chatmail Relay secure?

OSV.dev has no published security advisories for Chatmail Relay's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

Chatmail Relay replaces

Self-hosted WhatsApp alternativesSelf-hosted Signal alternatives

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SelfHostIndex: 79 · good

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