Plugin for Thunderbird Vers. 68.x+

Hi, I have written several automation add-ons for Thunderbird classic (<60.x) and the modern Thunderbird 68.x+ and I can write the addon you describe. To properly identify the emails in the database, I would suggest using a combination of Message-ID and Date since the Message-ID alone isn't guaranteed to be unique across email providers (and sometimes not even within the same domain).

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