Show HN:SMTP Tunnel – 偽裝成電子郵件流量的SOCKS5代理,以繞過DPI

Show HN:SMTP Tunnel – 偽裝成電子郵件流量的SOCKS5代理,以繞過DPI

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此篇Show HN介紹了SMTP Tunnel,一個將TCP流量偽裝成SMTP電子郵件通訊的高速隱蔽通道,旨在繞過深度封包檢測(DPI)防火牆。文章提供了伺服器和客戶端的設定步驟,供使用者實施此解決方案。

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A high-speed covert tunnel that disguises TCP traffic as SMTP email communication to bypass Deep Packet Inspection (DPI) firewalls.

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📧 SMTP Tunnel Proxy

A high-speed covert tunnel that disguises TCP traffic as SMTP email communication to bypass Deep Packet Inspection (DPI) firewalls.

🎯 Features

📚 For in-depth technical details, protocol specifications, and security analysis, see TECHNICAL.md.

⚡ Quick Start

📋 Prerequisites

🚀 Server Setup (VPS)

Step 1️⃣: Get a Domain Name

Get a free domain pointing to your VPS:

Example: myserver.duckdns.org → 203.0.113.50 (your VPS IP)

Step 2️⃣: Run the Installer

The installer will:

That's it! Your server is ready.

➕ Add More Users Later

🔄 Update Server

💻 Client Setup

Option A: Easy Way (Recommended)

The launcher will automatically install dependencies and start the client.

✅ You should see:

Option B: Manual Way

Option C: Custom Configuration

📖 Usage

🌐 Configure Your Applications

Set SOCKS5 proxy to: 127.0.0.1:1080

Settings → Network & Internet → Proxy → Manual setup → socks=127.0.0.1:1080

System Preferences → Network → Advanced → Proxies → SOCKS Proxy → 127.0.0.1:1080

✅ Test Connection

⚙️ Configuration Reference

🖥️ Server Options (config.yaml)

👥 User Options (users.yaml)

Each user can have individual settings:

💻 Client Options

📋 Service Management

🔧 Command Line Options

🖥️ Server

💻 Client

👥 User Management

📁 File Structure

📦 Installation Paths (after install.sh)

🔧 Troubleshooting

❌ "Connection refused"

❌ "Auth failed"

❌ "IP not whitelisted"

❌ "Certificate verify failed"

🐛 Debug Mode

🔐 Security Notes

📚 For detailed security analysis and threat model, see TECHNICAL.md.

📄 License

This project is provided for educational and authorized use only. Use responsibly and in accordance with applicable laws.

⚠️ Disclaimer

This tool is designed for legitimate privacy and censorship circumvention purposes. Users are responsible for ensuring their use complies with applicable laws and regulations.

Made with ❤️ for internet freedom

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A high-speed covert tunnel that disguises TCP traffic as SMTP email communication to bypass Deep Packet Inspection (DPI) firewalls.

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