Comment (by Roland Haas):

I changed the line length to 80 characters, to have a maybe less arbitrary limit. Line breaks are only visual so copy&paste still picks up the full string and this also does not interfere with URL being converted to external anchors.

This does not help with text emails that just have very short encoded line breaks due to the mail client like this one http://lists.einsteintoolkit.org/pipermail/users/2021-February/007762.html

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/723/archived-emails-to-mailing-lists-are