I've found a problem in Gnus v5.8.3 (with XEmacs 21.1 p8) when
forwarding messages (with S o m) that I've received with
quoted-printable encoded equals sign characters.  In particular, this
was with a URL like the following:

    http://www.invalid/lookup?id=3DEA123456

That's "? i d equals E A ...".  I'm forwarding this message at the
bottom of this one, which should show the problem.  When I receive
this message, I see the character at 0xea, i.e. "=EA".