John Levine wrote:
For instance, what would happen if mail servers provided feedback to
both senders (on a per message basis in the form of NDNs)
Well, since 95% of all mail is spam, and all the spam has fake return
addresses, you'd increase the amount of bogus NDNs by more than an
order of magnitude. No thanks.
Incidentally, on a bad day I already get 400,000 NDNs from mail that I
didn't send, just from the minority of MTAs that send NDNs in response
to spam now. This is not a hypothetical problem.
Point of order: is NDN "produce bounce" or does it include "reject"?
In my response I took NDN to mean "reject". Not bounce.
Filters should never bounce (and that would go in a filtering BCP).
_______________________________________________
Ietf mailing list
Ietf(_at_)ietf(_dot_)org
https://www.ietf.org/mailman/listinfo/ietf