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That is must have add-on. That was built-in in early versions of Thunderbird, but removed. a report should be made to the police for damaging the functionality of this extension. Undermining primary security should be a crime. Or what do you think? I have been scolded by people who don't have the extension, asking why I'm spamming them.
Since an angry person lived in the neighborhood, I went to visit him to show me these emails. i installed this download on his email client and it showed none of the emails were from me even though they had my real name on them "sender" column.