Why did I get an e-mail with a nonsensical header?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Puzzle Game Looping

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Chapters
00:00 Question
00:47 Accepted answer (Score 82)
01:57 Answer 2 (Score 21)
02:53 Thank you

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Full question
https://superuser.com/questions/1090258/...

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Tags
#email

#avk47