use a string that will never match.

8646fe22 · Simon Marshall · f45b7beb · 8646fe22
Commit 8646fe22 authored Mar 27, 1998 by Simon Marshall
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lisp/mail/sendmail.el lisp/mail/sendmail.el +1 -1

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--- a/lisp/mail/sendmail.el
+++ b/lisp/mail/sendmail.el
@@ -272,7 +272,7 @@ actually occur.")
 	    ;; Use EVAL to delay in case `mail-header-separator' gets changed.
 	    '(eval .
 	      (let ((separator (if (zerop (length mail-header-separator))
-				   " "
+				   " \\`\\' "
 				 (regexp-quote mail-header-separator))))
 		(cons (concat "^" separator "$") 'font-lock-warning-face)))
 	    ;; Use MATCH-ANCHORED to effectively anchor the regexp left side.