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Thunderbird for Android 8.0 Takes Flight - The Thunderbird Blog
(blog.thunderbird.net)
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Why locked? Proton mail does'nt have a protocol?
No IMAP/SMTP support with ProtonMail. You have to run their bridge application locally to get that functionality.
IMAP/SMTP does make their encryption at rest impossible, AFAIK similar providers like tuta don't have those either.