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(emacs-version)
"GNU Emacs 18.57.8 of Fri Feb 22 1991 on pit-manager (berkeley-unix)"

mail-send-and-exit in sendmail.el still checks if the next window is
in rmail-mode before deleting it.  This is a bug according to the help
information for the function and is also completely silly; there's no
reason for rmail-mode to be treated specially.  (Also, applying
DeMorgan's Theorem results in more efficient code here.)  Patch:

*** /mit/emacs/emacs-18.57/lisp/sendmail.el	Wed Jan  9 17:04:09 1991
--- /tmp/sendmail.el	Fri Mar  1 16:19:22 1991
***************
*** 152,164 ****
    (interactive "P")
    (mail-send)
    (bury-buffer (current-buffer))
!   (if (and (not arg)
! 	   (not (one-window-p))
! 	   (save-excursion
! 	     (set-buffer (window-buffer (next-window (selected-window) 'not)))
! 	     (eq major-mode 'rmail-mode)))
!       (delete-window)
!     (switch-to-buffer (other-buffer (current-buffer)))))
  
  (defun mail-send ()
    "Send the message in the current buffer.
--- 152,160 ----
    (interactive "P")
    (mail-send)
    (bury-buffer (current-buffer))
!   (if (or arg (one-window-p))
!       (switch-to-buffer (other-buffer (current-buffer)))
!     (delete-window)))
  
  (defun mail-send ()
    "Send the message in the current buffer.

--
Barr3y Jaspan, bjaspan@mit.edu
Watchmaker Computing