[westurner]

https://github.com/x011/smtp-tunnel-proxy :

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

[petcat]

It seems like these smuggle-disguise protocols are almost always trivially detectable.

[VortexLain]

Yes, but such tools aren't popular enough for the censor to specifically target.

[DetectDefect]

No mention of any security review, or even testing. Reason enough to stay away from such tools.

[westurner]

Good point.