(In reply to Wayne Mery (:wsmwk) from comment #1) > "Repair" does indeed cause a redownload. As far as I know that's the only way to ensure an imap folder will be properly repaired in as many situations as possible. But, they wouldn't be received as new messages through the inbox, and therefore filters would not be invoked. But it would refresh each folder's contents from the server. > It would be worth testing how this triggers filters. So I take about my implication that Thunderbird filters could be involved. Perhaps the server caused the duplications.
Bug 1805738 Comment 2 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
(In reply to Wayne Mery (:wsmwk) from comment #1) > "Repair" does indeed cause a redownload. As far as I know that's the only way to ensure an imap folder will be properly repaired in as many situations as possible. But, they wouldn't be received as new messages through the inbox, and therefore filters would not be invoked. But it would refresh each folder's contents from the server. > It would be worth testing how this triggers filters. So I take ~~about~~ back my implication that Thunderbird filters could be involved. Perhaps the server caused the duplications.