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This deserves a classic legal response.
Dear Mr Cox: Attached is a letter that we received on November 19, 1974. I feel that you should be aware that some asshole is signing your name to stupid letters.
https://www.loweringthebar.net/wp-content/uploads/2011/03/browns_letter_1974.pdf
Same with OneDrive.
It’s just a folder of markdown files, basically anything should work.