Ned Freed said the following:
Very good point. We have existing users that depend on cascading notifications, so the way I had planned to implement this is to count auto-submitted fields and compare against a settable threshhold. The default for the threshhold willbe 1 but operators will be able to set it higher if they choose.
There's a problem with that. RFC 3834 says this, at the end of section 5.1: The maximum number of Auto-Submitted fields that may appear in a message header is 1.We could update that here, but there's no reason to think that there isn't already code out there that strips extra Auto-Submitted headers, and there's every reason to think that setting the threshold > 1 would expose one to problems.
I think it's a Bad Idea to send notifications about Auto-Submitted messages. Redirect can do it, and redirect ought to be sticking Resent-* headers in. Those headers are already defined in a way that lets one count them.
Barry