> > This assumes all messages are rejected within the SMTP session. > > Yes, exactly and the point several of us have been making is that > this is (a) easy (well, provided you're using a quality MTA; if not, > then switch to one) (b) running a sane mail system (c) fast > (d) resource-friendly and
>(e) most important of all, the _only_ way to > avoid sending UBE in response to forgeries (which are not going away > any time soon or quite possibly ever). Not quite the only way. If a postprocessing step is needed, it is trivial for the SMTP server to record any return path info that it knows in order for the post-processor to be able to send DSN's as accurately as the SMTP server itself. What we have here is yet another failure of imagination. --Michael Dillon
