[Backport] lisp/gnus/message.el (message-smtpmail-send-it): Make non-standard mail header separators work with smtpmail

lisp/gnus/ChangeLog

@@ -1,3 +1,8 @@
+2015-01-29  Lars Ingebrigtsen  <larsi@gnus.org>
+
+	* message.el (message-smtpmail-send-it): Remove the mail header
+	separator before sending.
+
 2015-01-28  Elias Oltmanns  <eo@nebensachen.de>
 
 	* nnimap.el (nnimap-find-expired-articles): Fix handling of

lisp/gnus/message.el

@@ -4828,6 +4828,11 @@ evaluates `message-send-mail-hook' just before sending a message.
 It is useful if your ISP requires the POP-before-SMTP
 authentication.  See the Gnus manual for details."
   (run-hooks 'message-send-mail-hook)
+  ;; Change header-delimiter to be what smtpmail expects.
+  (goto-char (point-min))
+  (when (re-search-forward
+	 (concat "^" (regexp-quote mail-header-separator) "\n"))
+    (replace-match "\n"))
   (smtpmail-send-it))
 
 (defun message-send-mail-with-mailclient ()