(smtpmail-via-smtp): Disable undo in SMTP buffer.

diff --git a/lisp/mail/smtpmail.el b/lisp/mail/smtpmail.el
index 175e32becdf1bbf7fc71920ded8dd08134923170..0eb956981ce5105fe151271848f945e05262bccd 100644 (file)
--- a/lisp/mail/smtpmail.el
+++ b/lisp/mail/smtpmail.el
@@ -605,6 +605,7 @@ This is relative to `smtpmail-queue-dir'.")
 
          ;; clear the trace buffer of old output
          (with-current-buffer process-buffer
+           (setq buffer-undo-list t)
            (erase-buffer))
 
          ;; open the connection to the server