Kai.Grossjohann(a)CS.Uni-Dortmund.DE (Kai Großjohann) writes:
 Maybe so, but upgrading Gnus does not change sendmail.el, as
 sendmail.el is not part of Gnus.  And a change in sendmail.el will
 not help Gnus, as Gnus uses message.el, instead. 
Understood.
 So, did you upgrade sendmail.el, as well? 
I'm running the sendmail.el which comes with XEmacs mail-lib v1.46,
with Simon's one-line patch applied.
The comments in my sendmail.el say:
;;; Synched up with: Emacs 21.0.106
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