Optimized all-in-one mail server for instant, secure messaging

This is a specialized fork of Maddy Mail Server optimized specifically for chatmail deployments. It provides a single binary solution for running secure, encrypted-only email servers designed for Delta Chat and similar messaging applications.

Chatmail servers are email servers optimized for secure messaging rather than traditional email. They prioritize:

• Instant account creation without personal information
• Encryption-only messaging to ensure privacy
• Automatic cleanup to minimize data retention
• Low maintenance for easy deployment

• Passwordless onboarding: Users can create accounts instantly via QR codes
• Encrypted messages only (outbound): Prevents sending unencrypted messages to external recipients
• Single binary deployment: Everything needed in one executable
• Delta Chat integration: Native support for Delta Chat account creation
• Web interface: Simple account creation and management interface

• Encrypted messages only (inbound): Filter incoming unencrypted messages
• Automatic message cleanup: Remove messages unconditionally after N days (currently 20 days)
• Stale account cleanup: Remove inactive addresses after M days without login
• Push notifications: Metadata support for real-time messaging
• Enhanced monitoring: Better observability for chatmail-specific metrics

See a working deployment at: inja.bid

This demonstrates the complete chatmail experience including:

• Instant account creation via QR code
• Web interface for account management
• Full Delta Chat integration

This chatmail-optimized version includes:

1. Simplified Configuration: Pre-configured for chatmail use cases
2. Chatmail Endpoint: Built-in HTTP/HTTPS endpoints for account creation
3. Encryption Enforcement: Automatic blocking of unencrypted outbound messages
4. Account Management: Streamlined user creation and cleanup processes
5. Delta Chat Integration: Native QR code generation and account provisioning

┌─────────────────┐    ┌──────────────────┐    ┌─────────────────┐
│   Web Interface │    │   SMTP/IMAP      │    │   Delta Chat    │
│   (QR Codes)    │◄──►│   Mail Server    │◄──►│   Clients       │
└─────────────────┘    └──────────────────┘    └─────────────────┘
         │                       │                       │
         └───────────────────────┼───────────────────────┘
                                 │
                    ┌──────────────────┐
                    │   SQLite Storage │
                    │   (Accounts &    │
                    │    Messages)     │
                    └──────────────────┘

This project maintains compatibility with the upstream Maddy project while adding chatmail-specific optimizations. Contributions should:

1. Maintain backward compatibility with standard Maddy configurations
2. Follow the chatmail specification and best practices
3. Include tests for new chatmail-specific features
4. Update documentation for any user-facing changes

This fork periodically syncs with the upstream Maddy project to incorporate security updates and improvements. Chatmail-specific features are implemented as optional modules that don't interfere with standard Maddy functionality.

This project inherits the GPL-3.0 license from the upstream Maddy Mail Server project.

• Live Demo: inja.bid
• Upstream Project: Maddy Mail Server
• Delta Chat: https://delta.chat
• Chatmail Specification: Delta Chat Chatmail Docs
• Documentation: Setup Guide

For traditional email server needs, consider using the upstream Maddy Mail Server project.