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Some (not all) sent mails being duplicated in Sent folder

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  • Last reply by njhp94

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I use Thunderbird - currently v115.1 x64 on Windows - as the client for my Protonmail account. Lately (like the past couple of weeks) I notice that some - not all - of the mails I send are duplicated in the sent folder. If I check with the recipients, they have only received a single mail. What could cause this intermittent duplication? As an example, here's a screenshot of the last ten or so sent mails. Two are duplicated and the rest not.

I never noticed this problem before upgrading from TB 102 to TB115.

I use Thunderbird - currently v115.1 x64 on Windows - as the client for my Protonmail account. Lately (like the past couple of weeks) I notice that some - not all - of the mails I send are duplicated in the sent folder. If I check with the recipients, they have only received a single mail. What could cause this intermittent duplication? As an example, here's a screenshot of the last ten or so sent mails. Two are duplicated and the rest not. I never noticed this problem before upgrading from TB 102 to TB115.
Attached screenshots

All Replies (2)

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First right click the folder and select properties and then the repair button. Does that make the duplicates go away?

I have zero patience for the proton bridge, but it could well be copying sent mail to the IMAP send folder as well as Thunderbird doing so. Try turning off Thunderbird's copy, or place it in another folder and see if that has an impact on duplicates.

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Thanks, but I'd already run a repair on the folder (didn't change anything) before I posted my query.

I've changed the TBird Protonmail account settings to save sent mails in a local folder. Will see what happens.