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From: Dave Love <d.love@dl.ac.uk>
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Subject: bad rfc2047 encoding
Date: 15 Aug 2002 23:00:41 +0100
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In Emacs 21.2, I see

(with-temp-buffer
  (insert "To: Kai.Grossjohann@CS.Uni-Dortmund.DE (Kai Gro=DFjohann)
")
  (rfc2047-encode-message-header)
  (buffer-string))
  =3D> "To: Kai.Grossjohann@CS.Uni-Dortmund.DE (Kai =3D?iso-8859-1?q?Gro=3D=
DFjohann)?=3D
"

which is an invalid encoding according to =A75 of rfc2047, and Exim
refuses to deliver the result:

  Kai.Grossjohann@CS.Uni-Dortmund.DE (Kai =3D?iso-8859-1?q?Gro=3DDFjohann)?=
=3D: malformed address: ?=3D may not follow Kai.Grossjohann@CS.Uni-Dortmund=
.DE (Kai =3D?iso-8859-1?q?Gro=3DDFjohann)

I'm surprised this hasn't been noticed and fixed before, but I think
it needs fixing for 21.3 by someone more familiar with the standards
and the logic in rfc2047.el.