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IMAP/ POP ?

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my thunderbird email was set up in a way that if i would delete an email on thunderbird it would also delete it from my mail app on my iphone. which is fine but on the other hand when i would delete the email on my phone, it would stay in thunderbird on my pc (which is the way i want it to be). Now for some reason something changed and when i delete an email from my phone it also deletes it from TB on my pc. how do i go back to how it was ? (both my pc and iphone are currently set as IMAP) thanks

my thunderbird email was set up in a way that if i would delete an email on thunderbird it would also delete it from my mail app on my iphone. which is fine but on the other hand when i would delete the email on my phone, it would stay in thunderbird on my pc (which is the way i want it to be). Now for some reason something changed and when i delete an email from my phone it also deletes it from TB on my pc. how do i go back to how it was ? (both my pc and iphone are currently set as IMAP) thanks

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Thunderbird was originally setup for POP access, while your phone's mail app used IMAP. You need to remove the IMAP account from Thunderbird and add it afresh for POP access.

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that was no help