Delete duplicate emails in mutt
“Let say you want to delete all duplicate messages in the current mailbox. Just do a tag-pattern (bound to T here), put in ~= as the pattern, then all duplicates will be tagged. After that, you can delete tagged messages (bound to ;d, or just d if you have $auto_tag=yes).”
Robbed from here. However it doesn’t work unless you are sorted in thread mode as described here.
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