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A comment on Why a European mobile operating system can’t challenge Android and iOS. Parent comment

Re:Why a European mobile operating system can’t challenge An... by WirelessGigabit on Monday March 27, 2023 @12:17PM (#35328558)
If you put 2 labels on an email, then it is represented twice over IMAP.

IMAP is folder based, not label based.

And what this means is that if you remove an email from a folder, you don't actually remove it completely, you just remove the label, and the email continues to exist elsewhere.

(I might be wrong about this behavior: the behavior of deleting an email over IMAP depends on whether it has labels left or not).

Update: good read about how the system doesn't behave like you think it does

https://www.tomscott.com/fix-gmail-labels-threads/

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Re:Why a European mobile operating system can’t challenge An... by ghusto on Tuesday March 28, 2023 @07:00AM (#35338723)
Yeah I was aware they're doing some black-box stuff to make it work, but wasn't too fussed as long as it did.

I have the issue you describe with ProtonMail's labelling, but not Gmail's.

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