Is this implemented at all or is it a theory?
Theory today, we'll see what next week brings.
But given the ongoing arguments over SRS/RPR/SES/RSR/whatever
all trying to use in-band forwarding information and
none quite getting everything right, I think a completely
different approach should be considered. It may get rejected,
but it has as much (I think more) merit than any other method proposed.
I could probably hack a preliminary implementation in a few hours.
As I refine my thoughts on it, it gets simpler.
Database cost should be similar to greylisting, less since
only forwarded messages are tracked.
--
Daniel Taylor VP Operations Vocal Laboratories, Inc.
dtaylor(_at_)vocalabs(_dot_)com http://www.vocalabs.com/
(952)941-6580x203