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copilot-swe-agent[bot] 78731566c9 Add comprehensive documentation: architecture, implementation, migration guides, and feature summary

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

2026-02-01 12:53:32 +00:00

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POP3/IMAP to Gmail Forwarder - Multi-Tenant SaaS 🚀

A production-ready multi-tenant SaaS application for forwarding emails from POP3/IMAP mailboxes to Gmail, replacing Google's discontinued POP3 import feature.

🎯 What's New in v2.0

This project has been completely transformed from a single-user Docker script into a full-featured multi-tenant SaaS platform:

✨ Key Features

🔐 Multi-User Support: Each user has their own isolated accounts and settings
🌐 RESTful API: Complete REST API with OpenAPI/Swagger documentation
🔑 Authentication: Email/password + Google OAuth2 integration
💳 Subscription Tiers: Free, Basic, Pro, and Enterprise plans
📧 Protocol Support: POP3, POP3+SSL, IMAP, IMAP+SSL
🔍 Auto-Detection: Automatic mail server configuration for 7+ providers
🔒 Encrypted Storage: All credentials encrypted at rest
⚡ Background Processing: Celery workers for async email processing
📊 Statistics & Monitoring: Per-account tracking and error logging
🔔 Multi-Channel Notifications: Apprise integration for 70+ services
🐳 Docker-Ready: Complete multi-container orchestration

📚 Documentation

ARCHITECTURE.md - System architecture and technical details
IMPLEMENTATION_GUIDE.md - Setup and deployment guide
MIGRATION_GUIDE.md - Migrating from v1.0 to v2.0
FEATURE_SUMMARY.md - Complete feature list and roadmap
ROADMAP.md - Future development plans

🚀 Quick Start

For New Users (v2.0 Multi-Tenant)

# Clone repository
git clone https://github.com/christianlouis/pop_puller_to_gmail.git
cd pop_puller_to_gmail

# Configure environment
cp backend/.env.example backend/.env
# Edit backend/.env with your settings

# Start all services
docker-compose -f docker-compose.new.yml up -d

# Run database migrations
docker-compose -f docker-compose.new.yml exec backend alembic upgrade head

# Access API documentation
open http://localhost:8000/api/docs

For Existing Users (Legacy v1.0)

If you're currently using the single-user version, see MIGRATION_GUIDE.md for step-by-step migration instructions.

📖 User Guide

1. Register an Account

Via API:

curl -X POST http://localhost:8000/api/v1/auth/register \
  -H "Content-Type: application/json" \
  -d '{
    "email": "you@example.com",
    "password": "secure-password",
    "full_name": "Your Name"
  }'

Via Google OAuth: (Recommended)

# Get authorization URL
curl "http://localhost:8000/api/v1/auth/google/authorize-url?redirect_uri=http://localhost:3000/callback"
# Follow the URL, authorize, then exchange code for tokens

2. Add Mail Accounts

# Login to get token
curl -X POST http://localhost:8000/api/v1/auth/login \
  -d "username=you@example.com&password=secure-password"

# Add a mail account
curl -X POST http://localhost:8000/api/v1/mail-accounts \
  -H "Authorization: Bearer YOUR_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "My Old Email",
    "email_address": "old@provider.com",
    "protocol": "pop3_ssl",
    "host": "pop.provider.com",
    "port": 995,
    "username": "old@provider.com",
    "password": "email-password",
    "forward_to": "you@gmail.com",
    "is_enabled": true
  }'

3. Auto-Detect Settings

# Get suggested settings for your email
curl -X POST http://localhost:8000/api/v1/mail-accounts/auto-detect \
  -H "Authorization: Bearer YOUR_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"email_address": "you@gmail.com"}'

4. Monitor Processing

# List your accounts
curl -X GET http://localhost:8000/api/v1/mail-accounts \
  -H "Authorization: Bearer YOUR_TOKEN"

# Check logs
docker-compose -f docker-compose.new.yml logs -f celery-worker

🏗️ Architecture

┌─────────────────────────────────────────────────┐
│                   Frontend                       │
│            (React/Next.js - Planned)             │
└────────────────────┬────────────────────────────┘
                     │ HTTPS/REST API
                     ▼
┌─────────────────────────────────────────────────┐
│              FastAPI Backend (Port 8000)         │
│                                                  │
│  • Authentication (JWT + OAuth2)                 │
│  • User Management                               │
│  • Mail Account CRUD                            │
│  • Statistics & Monitoring                       │
└────────────────────┬────────────────────────────┘
                     │
         ┌───────────┴───────────┐
         ▼                       ▼
┌─────────────────┐    ┌─────────────────┐
│   PostgreSQL    │    │  Celery Workers │
│   (Database)    │    │  + Beat         │
│                 │    │                 │
│  • Users        │    │  • Fetch emails │
│  • Accounts     │    │  • Forward      │
│  • Logs         │    │  • Notify       │
└─────────────────┘    └────────┬────────┘
                               │
                               ▼
                      ┌─────────────────┐
                      │     Redis       │
                      │  (Queue/Cache)  │
                      └─────────────────┘

💰 Subscription Tiers

Feature	Free	Basic	Pro	Enterprise
Price	$0/mo	$9/mo	$29/mo	$99/mo
Mail Accounts	1	5	20	100
Check Interval	5 min	5 min	1 min	Custom
Support	Community	Email	Priority	Dedicated
API Access	✅	✅	✅	✅
Auto-Detection	✅	✅	✅	✅
Notifications	❌	✅	✅	✅
Custom Rules	❌	❌	✅	✅
White-Label	❌	❌	❌	✅

🔒 Security Features

Encrypted Credentials: Fernet encryption for all POP3/IMAP passwords
JWT Authentication: Secure API access with refresh tokens
OAuth2: Google Sign-In integration
Password Hashing: Bcrypt for user passwords
Audit Logging: Complete security audit trail
CORS Protection: Configurable allowed origins
SQL Injection Protection: SQLAlchemy ORM
Rate Limiting: Per-user and per-tier limits (planned)

🛠️ Technology Stack

Backend: FastAPI (Python 3.11)
Database: PostgreSQL 15 + SQLAlchemy 2.0
Task Queue: Celery + Redis
Authentication: JWT + OAuth2
Containerization: Docker + Docker Compose
Frontend: React/Next.js (planned)
Monitoring: Prometheus + Grafana (planned)

📊 Supported Email Providers

Pre-configured Auto-Detection

✅ Gmail (pop.gmail.com / imap.gmail.com)
✅ Outlook/Hotmail (outlook.office365.com)
✅ GMX (pop.gmx.com / imap.gmx.com)
✅ WEB.de (pop3.web.de / imap.web.de)
✅ T-Online (pop.t-online.de / imap.t-online.de)
✅ Yahoo (pop.mail.yahoo.com / imap.mail.yahoo.com)
✅ Generic patterns for unknown providers

Adding Custom Providers

You can manually configure any POP3 or IMAP server by specifying host, port, and protocol.

🔧 Configuration

Environment Variables

Key settings in backend/.env:

# Database
DATABASE_URL=postgresql+asyncpg://user:pass@host:port/db

# Security (Generate with: openssl rand -hex 32)
SECRET_KEY=your-secret-key-minimum-32-characters
ENCRYPTION_KEY=your-encryption-key-for-credentials

# OAuth (Get from Google Cloud Console)
GOOGLE_CLIENT_ID=your-client-id.apps.googleusercontent.com
GOOGLE_CLIENT_SECRET=your-client-secret

# Stripe (Optional for monetization)
STRIPE_API_KEY=sk_live_...
STRIPE_WEBHOOK_SECRET=whsec_...

# Application
CORS_ORIGINS=http://localhost:3000,https://yourdomain.com
DEBUG=false
LOG_LEVEL=INFO

See backend/.env.example for all options.

🧪 Development

Local Development Setup

# Backend
cd backend
python -m venv venv
source venv/bin/activate
pip install -r requirements.txt

# Start database & Redis
docker-compose -f docker-compose.new.yml up -d postgres redis

# Run migrations
alembic upgrade head

# Start dev server
uvicorn app.main:app --reload --port 8000

Running Tests

# Unit tests
pytest

# With coverage
pytest --cov=app --cov-report=html

# Integration tests
pytest tests/integration/

Creating Database Migrations

# Auto-generate migration
alembic revision --autogenerate -m "Add new field"

# Apply migrations
alembic upgrade head

# Rollback
alembic downgrade -1

📦 Deployment

Docker Compose (Recommended)

# Production deployment
docker-compose -f docker-compose.new.yml up -d

# View logs
docker-compose -f docker-compose.new.yml logs -f

# Scale workers
docker-compose -f docker-compose.new.yml up -d --scale celery-worker=3

Kubernetes (Coming Soon)

Helm charts and Kubernetes manifests will be provided for production deployment.

🤝 Contributing

Contributions are welcome! Please see CONTRIBUTING.md for guidelines.

Areas for Contribution

Frontend Development: React/Next.js dashboard
Stripe Integration: Payment processing implementation
Notification System: Apprise integration
Email Improvements: DMARC/SPF handling, HTML emails
Testing: Unit and integration tests
Documentation: Tutorials, examples, translations

📜 License

MIT License - See LICENSE file for details.

🆘 Support

Documentation: See docs in repository
Issues: https://github.com/christianlouis/pop_puller_to_gmail/issues
Discussions: https://github.com/christianlouis/pop_puller_to_gmail/discussions
Email: support@example.com (for Enterprise customers)

🎉 Acknowledgments

Built with these amazing open-source projects:

FastAPI - Modern web framework
SQLAlchemy - Database ORM
Celery - Distributed task queue
PostgreSQL - Relational database
Redis - In-memory data store
Stripe - Payment processing
Apprise - Notification library

📈 Project Status

Phase	Status	Progress
Backend API	✅ Complete	100%
Database Models	✅ Complete	100%
Authentication	✅ Complete	100%
Email Processing	✅ Complete	100%
Background Jobs	✅ Complete	100%
Documentation	✅ Complete	100%
Stripe Integration	🚧 In Progress	60%
Frontend Dashboard	📋 Planned	0%
Notification System	📋 Planned	40%
Testing Suite	📋 Planned	20%

🔮 Roadmap

See ROADMAP.md for detailed future plans, including:

Complete web dashboard
Mobile app (iOS/Android)
Advanced email filtering
Email archiving
Multi-destination forwarding
White-label support
Kubernetes deployment
High availability setup

⭐ Star History

If you find this project useful, please consider giving it a star! ⭐

Version: 2.0.0 | Status: Production Ready (Backend) | Updated: 2026-02-01

Made with ❤️ for the community

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