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I was thinking about subbing to Proton and researched a few other alternatives but ended up coming to the conclusion that it is kinda useless for me and most people. Unless the other person(s) you email are also using Proton or a similar service then you’re still compromised. I guess it makes sense for some people like journalists or politicians, but only if you know your peers are also using it. I ended up moving everything to iCloud which does most of what you’re looking for.
You can but you won’t win unless you can prove anything, so good luck with that.