Show HN: SMTP Tunnel – A SOCKS5 proxy disguised as email traffic to bypass DPI
Published: (January 6, 2026 at 07:30 PM EST)
1 min read
Source: Hacker News
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.