To remove duplicate emails in a folder, select multiple messages (or select all messages in a folder by clicking Edit ▸ Select All or pressing Ctrl+A) and click Message ▸ Remove Duplicate Messages.
Downloading duplicate emails may be due to one of the following reasons:
There are several copies of the same message in the mailbox
Evolution is having a problem with the UIDL extension.
The cache files located at $HOME/.local/share/evolution/mail/local/ are not writable.
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