Tyr - P2P Email — Open Source Browser App

Tyr is a revolutionary Android application that provides true peer-to-peer email communication using the Yggdrasil mesh network. Unlike traditional email systems that rely on centralized servers, Tyr runs a complete email server directly on your device.

Key Features:

• True P2P Email - No central servers, no cloud infrastructure. Your device IS the email server.
• Yggdrasil Integration - Built on the Yggdrasil overlay mesh network providing secure, end-to-end encrypted connections.
• Standard Protocols - Exposes SMTP/IMAP protocols on localhost, compatible with standard email clients like DeltaChat.
• Privacy First - All data stays on your device. Encrypted configuration backup with AES-256-GCM encryption.
• DeltaChat Ready - Seamless integration with DeltaChat for instant messaging over email.
• Cryptographic Identity - Your email address is derived from your Ed25519 public key, ensuring authenticity.
• Mesh Networking - Connect via public Yggdrasil peers or configure your own custom peers.
• Battery Optimized - Sophisticated power management with timed wake locks and network monitoring.
• Secure by Design - Password protection using Android Keystore with EncryptedSharedPreferences.
• Backup & Restore - Export and import all settings with optional inclusion of your cryptographic keys.

Technical Details:

The app runs a foreground service that manages the native Yggmail library (Go-based), providing SMTP on port 1025 and IMAP on port 1143 (localhost only). Your mail address format is: <64-hex-characters>@yggmail, cryptographically derived from your Ed25519 key pair.

Perfect For:

• Privacy enthusiasts who want control over their communications
• Users seeking decentralized alternatives to traditional email
• DeltaChat users wanting P2P messaging infrastructure
• Anyone interested in mesh networking technology

Requirements:

• Android 6.0 (API 23) or higher
• Internet connection for initial Yggdrasil peer connections
• Battery optimization exemption recommended for best performance

Join the peer-to-peer email revolution with Tyr.