Damus
note125clf...
djsumdog profile picture
I think it's part of the way MIME encoding and multipart message boundaries are done with HTML/plaintext e-mails. Remember e-mail is old and based on 7-bit ASCII.

Hit Ctrl+U in Thunderbird on a random e-mail and look at the source. It'll make more sense.
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djsumdog · 6w
oh right, it's the fixed width line boundary. So it's probably due to cutting and pasting the plain-text or source into different documents. https://djsumdog.com/media/92/40/4c/92404c6ab95b61528c4559dca0d314d09b85a1594e21c516986d7647ad8bc9af.png