Show HN: SMTP Tunnel – A SOCKS5 proxy disguised as email traffic to bypass DPI

Source: Hacker News

Overview

A fast SOCKS5 proxy that tunnels your traffic through what looks like normal SMTP email, bypassing Deep Packet Inspection firewalls.

How it works

• The client runs a local SOCKS5 proxy (e.g., 127.0.0.1:1080).
• Traffic is sent to the server disguised as SMTP commands (EHLO, STARTTLS, AUTH).
• Deep Packet Inspection (DPI) sees a legitimate email session, allowing the traffic to pass.