Removing duplicate emails in Thunderbird

I need to stop the duplicate mail (which is already in my mail box) in Thunderbird or any mail box.

Are there any filters for this?

Solution 1:

There is no need for an extension.

There's a config option in Thunderbird to deal with duplicate messages. You can delete, move to trash or mark as read if you don't want them appearing in your inbox like normal mail (who would? - I don't know why this isn't set to trash by default).

Ghacks has an article about the topic: Automatically remove duplicate mails in Thunderbird.

Access the config editor via the “Advanced Options” tab (Tools → Options → Advanced → Config Editor) and modify the mail.server.default.dup_action flag:

• keep = 0
• delete = 1
• move to trash = 2
• mark as read = 3

It is recommended to experiment with "move to trash" and "mark as read" settings before using the delete option.

Solution 2:

How about the "Remove Duplicate Messages" plugin for Thunderbird?