Remove Duplicate Messages

Rated 5 out of 5 stars

by PatrickZZ on March 27, 2021 · permalink

This add-on works great with Thunderbird 78.9.0 on a Mac running Catalina.

Like others, I got zero results at first. Fixes:
- Restart Thunderbird
- Tools > Add-on Options > Remove Duplicate Messages and change filter settings.
Under "General Settings" I left all defaults on. Everything checked. Default action "Move to Trash"
Under "Message Comparison" I kept *everything* checked except Size (important!) and Folder and set "Time Comparison Resolution" to Seconds.

Found 7K duplicates. Created a duplicates local folder and dumped them there. Yay!