Duplicate mails can be a problem in the most advanced email applications. It does not matter if you use Outlook, Thunderbird or a self coded mail program, duplicate mails can be a problem in all of them. This can happen for instance if you merge folders in the mail program or if a server or download error has the result that the mails are downloaded twice from the mail server.
The Remove Duplicate Messages extension for Thunderbird is able to quickly get rid if duplicate mails in Thunderbird. Just right-click a folder in Thunderbird after installation the extension and choose Remove Duplicate Messages from the menu. Mails can be sorted by variables like sender, messageid or subject.
A test run on my main computer had the result that it did show more than 1000 duplicate messages. I thought that this was an error at first but it was not. The extension marks one mail with the keep flag and all other mails that are duplicates of it with the DEL flag.
A left click on a mail opens the containing folder of it, a right-click a small popup window with the most important details of the selected mail.
Oh, and guess what. Deleting those 1000 mails reduced the size of all mailboxes by more than 60 Megabytes.
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I’ll definitely give this a try – thanks!
So where is it? This article would be more helpful if it included an actual link to go get the tool described…
Michael the article does contain a link to the extension.
The Alternate extension is better:
https://addons.mozilla.org/en-US/thunderbird/addon/4654
vs
https://addons.mozilla.org/en-US/thunderbird/addon/956