bug#67520: 29.1; Mention headers

[Dan Jacobson]

>>>>> "EA" == Eric Abrahamsen <eric@ericabrahamsen.net> writes:

EA> And the real question is how to offer this option to the user.
EA> Everything is already thoroughly overloaded...

Yup, I just tested it and the only difference with the message before
gnus got its hands one it was

0a1
> From nobody Tue Dec  5 13:00:45 2023
65a67
> X-Gnus-Mail-Source: maildir:~/Maildir/new
67a70,71
> MIME-Version: 1.0
> Content-Type: text/plain
89a94
>

And it is good that the X-Gnus-Mail-Source doesn't show up in the
forwarded message too.

So you are on the right track.