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Time to celebrate: Tutanota is now Tuta.
(tuta.com)
This is a most excellent place for technology news and articles.
Proton supports openPGP natively in its apps which is neat so encrypted emails are easier but you can use openPGP with k9 and Thunderbird too.
Unfortunately openPGP is very rarely used by anyone.
My point exactly. What's the point of having an encrypted mailbox if everything that arrives to it is unencrypted and easily intercepted?