Comment 6 for bug 557955

The fix adds the original Message-ID: to References: and also adds X-Mailman-Original-Message-ID: and X-Mailman-Original-References: headers for 'forensics'. Hopefully this will help at least partially mitigate threading issues that result from Message-ID: munging.

Also note that Munging the Message-ID in CookHeaders.py as suggested here is not a full solution as there still may be direct To: or Cc: recipients from 'reply all' and these are people likely to generate additional replies so the issue of multiple Message-ID:s is not solved by that approach.