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Proton Mail Finally Releases Desktop Apps With a Linux Beta Version
(news.itsfoss.com)
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It's worse than you thought.
The webmail provider released a dedicated browser that can only open the webmail and called it a "desktop" app.
Additionally, they don't support IMAP. There's an app to run on your computer that becomes a bridge. The proprietary protocol is translated to IMAP. You can't use your favorite client if your operating system can't run that bridge and you're not a premium user because for "reasons" only premium users can run that local bridge
They don't support IMAP because they want emails to remain end-to-end encrypted, and IMAP doesn't have any way of doing that. The gateway decrypts the emails locally, then serves them as plain text.
We need something better than IMAP, that's designed for modern use cases. Something that's not stateful... Maybe a web service or something like that. JMAP seems promising but barely any providers have implemented it.
Still, if an user prefers the convenience of using any client instead of e2e, could enable it in a setting. Maybe the user subscribed because they liked the interface and the overall features of the plan, and not because of the encrypted email solution and just wants to add the account on the mobile client instead of a dedicated app
Being closed like this IMHO is just to increase user retention
E2E is their flagship feature and pretty much only selling point. I'm really not surprised they don't allow to just disable it.