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There's already a service that supports this general concept called NGrok ( https://ngrok.com/ ).

They support plaintext tunnels for free, and encrypted tunnels starting at eight dollars a month.

I cam across the service when learning how to accept incoming traffic on kubernetes.

That's true. However, ngrok adds a lot of restrictions like "40 connections a minute", or capping the number of port forwardings. It's unclear if ngrok support port 25 either. Also, paying a premium for encrypted transport in 2020?

I think it's less that you're paying a premium for encrypted transport, but that the uncomfortable unencrypted one is set up primarily as a demo/trial service.

ngrok paid for itself in time saved within my first half an hour of using it. Excellent product.

I use it to develop a lot with twilio and salesforce callbacks.

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