This is the Linux app named SMTP Tunnel Proxy whose latest release can be downloaded as v1.3.0sourcecode.tar.gz. It can be run online in the free hosting provider OnWorks for workstations.
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SCREENSHOTS:
SMTP Tunnel Proxy
DESCRIPTION:
SMTP Tunnel Proxy is a high-speed covert tunneling proxy that disguises regular TCP traffic as legitimate SMTP email communication to evade deep packet inspection (DPI) firewalls and censorship systems. It implements a SOCKS5 proxy interface on the client that wraps outbound traffic into an SMTP-like handshake (EHLO, STARTTLS, AUTH) and encrypted payload, making the session appear to DPI systems as a normal email exchange. The tool supports modern TLS encryption (STARTTLS) with HMAC-SHA256 authentication, per-user secrets, IP whitelisting, and multiplexed connections over a single tunnel. With a simple installer and systemd service setup, users can quickly deploy it on a Linux VPS as a tunneled access point, then connect from Windows, macOS, or Linux clients using auto-generated client packages. The project is useful for environments where standard VPNs or proxies are blocked, offering a combination of performance and stealth.
Features
- Covert TCP tunneling disguised as SMTP traffic
- Standard SOCKS5 proxy interface for client apps
- TLS 1.2+ encryption with SMTP-like handshake
- Per-user authentication and IP whitelisting
- Auto-generated client packages for ease of use
- Auto-reconnect and resilience on connection loss
Programming Language
Python
Categories
This is an application that can also be fetched from https://sourceforge.net/projects/smtp-tunnel-proxy.mirror/. It has been hosted in OnWorks in order to be run online in an easiest way from one of our free Operative Systems.