On Sun, Jun 14, 2020 at 10:13:11AM -0500, David Wright wrote: > On Sat 13 Jun 2020 at 16:05:17 (+0200), l0f...@tuta.io wrote: > > However, this extra ">" should have been deleted upon viewing the email, no? > > How would the viewer's email client know whether the > in > >From had been added by some such scheme as above and should > be removed, or was a genuine occurrence in the original email?
Exactly. It's a non-reversible mangling of the message body, prompted by an extremely well-known limitation of the mbox formats. See <https://jdebp.eu/FGA/mail-mbox-formats.html> for more details. In particular, we're talking about the <https://jdebp.eu/FGA/mail-mbox-formats.html#mboxo> section. This same discussion seems to happen every month on this list, and it's still not clear to me WHY people can't understand it. It's not a new phenomenon. It's been this way forever.
