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Thunderbird's New Rust Integration: The Future of Email Clients?
(debugpointnews.com)
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That annoying thing is more on Protonmail though and I don't mean that as a negative, just more difficult to connect when the provider wants to keep things secure.
Proton could've just implemented everything they did with IMAP/SMTP on Thunderbird + OpenPGP with the same level of security, but they decided not to. Yes, their solution is convenient but also close to everything else.