1 files changed, 15 insertions, 2 deletions

diff --git a/lisp/mail/undigest.el b/lisp/mail/undigest.el
index 78e55553890..b80a5f4a48b 100644
--- a/lisp/mail/undigest.el
+++ b/lisp/mail/undigest.el
@@ -99,9 +99,22 @@ Leaves original message, deleted, before the undigestified messages."
                                       (progn (search-forward "\n\n"
                                                              nil 'move)
                                              (point))))
-                  (if (mail-fetch-field "To") nil
+                  (if (mail-fetch-field "To")
+                      nil
                     (goto-char (point-min))
-                    (insert "To: " digest-name "\n"))))))
+                    (insert "To: " digest-name "\n")))
+                ;; Digestifiers may insert `- ' on lines that start with `-'.
+                ;; Undo that.
+                (save-excursion
+                  (goto-char (point-min))
+                  (if (re-search-forward
+                       "\n\n----------------------------*\n*"
+                       nil t)
+                      (let ((end (point-marker)))
+                        (goto-char (point-min))
+                        (while (re-search-forward "^- " end t)
+                          (delete-char -2)))))
+                )))
           (setq error nil)
           (message "Message successfully undigestified")
           (let ((n rmail-current-message))