I agree that it is wrong to reject null return paths altogether. However
your suggestion is incompatible with backscatter detection systems (such
as BATV or Signed Envelope Sender) which assume that null return paths are
only used for bounce messages.
those systems are operating on false assumptions. it's never been the case
that <> was limited to bounce messages.
Yes. It'll be interesting to discover the extent of the interop problems :-)
I think we're going to have to tighten up the rules about null return
paths and bounces, because of the backscatter problem.
could you explain the backscatter problem? I'm not sure what you're referring
to.
Keith