Fix bug #9392 with rmail-forward.

lisp/simple.el (mail-encode-mml): New defvar.
 lisp/mail/rmail.el (mail-encode-mml): Add a defvar.
 (rmail-enable-mime-composing): Default to t.
 (rmail-forward): Use MIME method of forwarding only if both
 rmail-enable-mime-composing and rmail-enable-mime are non-nil.
 Set mail-encode-mml non-nil if the MIME method was used.
 lisp/mail/sendmail.el (mml-to-mime): Add autoload form.
 (mail-encode-mml): Add a defvar.
 (mail-mode): Make mail-encode-mml buffer-local and initialize it
 to nil.
 (mail-send): If mail-encode-mml is non-nil, run the outgoing
 message through mml-to-mime, and reset mail-encode-mml to nil.

lisp/ChangeLog

@@ -1,3 +1,21 @@
+2011-09-09  Eli Zaretskii  <eliz@gnu.org>
+
+	Fix for Savannah bug#9392.
+	* simple.el (mail-encode-mml): New defvar.
+
+	* mail/rmail.el (mail-encode-mml): Add a defvar.
+	(rmail-enable-mime-composing): Default to t.
+	(rmail-forward): Use MIME method of forwarding only if both
+	rmail-enable-mime-composing and rmail-enable-mime are non-nil.
+	Set mail-encode-mml non-nil if the MIME method was used.
+
+	* mail/sendmail.el (mml-to-mime): Add autoload form.
+	(mail-encode-mml): Add a defvar.
+	(mail-mode): Make mail-encode-mml buffer-local and initialize it
+	to nil.
+	(mail-send): If mail-encode-mml is non-nil, run the outgoing
+	message through mml-to-mime, and reset mail-encode-mml to nil.
+
 2011-09-09  Glenn Morris  <rgm@gnu.org>
 
 	* woman.el (woman-if-body): When processing an .el block,

lisp/mail/rmail.el

@@ -91,6 +91,7 @@ its character representation and its display representation.")
 (defvar messages-head)
 (defvar total-messages)
 (defvar tool-bar-map)
+(defvar mail-encode-mml)
 
 (defvar rmail-header-style 'normal
   "The current header display style choice, one of
@@ -642,7 +643,7 @@ unless the feature specified by `rmail-mime-feature' is available."
   :version "23.3"
   :group 'rmail)
 
-(defvar rmail-enable-mime-composing nil
+(defvar rmail-enable-mime-composing t
   "*If non-nil, RMAIL uses `rmail-insert-mime-forwarded-message-function' to forward.")
 
 ;; FIXME unused.
@@ -3794,9 +3795,17 @@ see the documentation of `rmail-resend'."
 	    ;; Insert after header separator--before signature if any.
 	    (rfc822-goto-eoh)
 	    (forward-line 1)
-	    (if (or rmail-enable-mime rmail-enable-mime-composing)
-		(funcall rmail-insert-mime-forwarded-message-function
-			 forward-buffer)
+	    (if (and rmail-enable-mime rmail-enable-mime-composing)
+		(prog1
+		    (funcall rmail-insert-mime-forwarded-message-function
+			     forward-buffer)
+		  ;; rmail-insert-mime-forwarded-message-function
+		  ;; works by inserting MML tags into forward-buffer.
+		  ;; The MUA will need to convert it to MIME before
+		  ;; sending.  mail-encode-mml tells them to do that.
+		  ;; message.el does that automagically.
+		  (or (eq mail-user-agent 'message-user-agent)
+		      (setq mail-encode-mml t)))
 	      (insert "------- Start of forwarded message -------\n")
 	      ;; Quote lines with `- ' if they start with `-'.
 	      (let ((beg (point)) end)

lisp/mail/sendmail.el

@@ -31,6 +31,9 @@
 
 (require 'rfc2047)
 
+(autoload 'mml-to-mime "mml"
+  "Translate the current buffer from MML to MIME.")
+
 (defgroup sendmail nil
   "Mail sending commands for Emacs."
   :prefix "mail-"
@@ -678,6 +681,7 @@ switching to, the `*mail*' buffer.  See also `mail-setup-hook'."
   :options '(footnote-mode))
 
 (defvar mail-mode-abbrev-table text-mode-abbrev-table)
+(defvar mail-encode-mml)
 ;;;###autoload
 (define-derived-mode mail-mode text-mode "Mail"
   "Major mode for editing mail to be sent.
@@ -701,6 +705,8 @@ Turning on Mail mode runs the normal hooks `text-mode-hook' and
   (make-local-variable 'mail-reply-action)
   (make-local-variable 'mail-send-actions)
   (make-local-variable 'mail-return-action)
+  (make-local-variable 'mail-encode-mml)
+  (setq mail-encode-mml nil)
   (setq buffer-offer-save t)
   (make-local-variable 'font-lock-defaults)
   (setq font-lock-defaults '(mail-font-lock-keywords t t))
@@ -934,6 +940,9 @@ the user from the mailer."
 	      (error "Invalid header line (maybe a continuation line lacks initial whitespace)"))
 	    (forward-line 1)))
 	(goto-char opoint)
+	(when mail-encode-mml
+	  (mml-to-mime)
+	  (setq mail-encode-mml nil))
 	(run-hooks 'mail-send-hook)
 	(message "Sending...")
 	(funcall send-mail-function)

lisp/simple.el

@@ -5729,6 +5729,11 @@ else the end of the last line.  This function obeys RFC822."
 	 "^\\([:\n]\\|[^: \t\n]+[ \t\n]\\)" nil 'move)
     (goto-char (match-beginning 0))))
 
+;; Used by Rmail (e.g., rmail-forward).
+(defvar mail-encode-mml nil
+  "If non-nil, mail-user-agent's `sendfunc' command should mml-encode
+the outgoing message before sending it.")
+
 (defun compose-mail (&optional to subject other-headers continue
 		     switch-function yank-action send-actions
 		     return-action)