100% legal way of doing it, use Binance and Kraken for instant.
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Where in the world do they mine crypto besides Iceland? It probably isn't worth mining any coins unless you have almost free electricity for all the computers farming coins, right?
If you set up such a structure, you'll need to consult a good tax lawyer in your own country. Most specialists are only familiar with the tax laws and regulations of their respective countries.
In other words, it doesn't really matter which server you host your email on or which provider you use. It's about securing the sent emails with OpenPGP and then hoping that no one intercepts your emails.