x011/smtp-tunnel-proxy: A high-speed covert tunnel that disguises TCP traffic as SMTP email communication to bypass Deep Packet Inspection (DPI) firewalls.

SMTP Tunnel Proxy disguises TCP traffic as SMTP email communication to bypass Deep Packet Inspection firewalls. It provides TLS-encrypted tunneling with SOCKS5 proxy interface, supporting multi-user authentication, IP whitelisting, and automatic reconnection. The tool includes one-liner server installation with systemd service, auto-generated client packages, and per-user access controls. Setup requires a Linux VPS with Python 3.8+, domain name for TLS verification, and port 587 access.