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Re:Protonmail can delete the wrong email and nobody cares by flupe on Wednesday November 02, 2022 @10:10AM (#33436070)
The repository for Proton Mail Bridge (which is open source) claims to also host the source for the Import Export app.

Here: https://github.com/ProtonMail/proton-bridge

Briefly looking at the files and code it's hard to tell whether that is still the case, but it's fair to assume Import-Export would reuse most of the machinery behind Bridge.

Re:Protonmail can delete the wrong email and nobody cares by timtom39 on Wednesday November 02, 2022 @10:45AM (#33436649)
bridge exposes imap making it easy to download all your data using Thunderbird or another client. I don't know about "export" because imap does what I want and is supported by most providers in the same format.