From: Jim Youll <jim(_at_)media(_dot_)mit(_dot_)edu>
...
What happens when delivery fails at either end? What if you send a
message from either the Internet side or the other side, and something
breaks? ...
I suppose that would be handled in a gateway. It could presumably
push bounces across itself, as well as regular messages, or even generate
them as appropriate...
How would that differ from the current situation? All working UUCP-STMP
gateways that I've seen generate bounces when their own UUCP or SMTP
transactions fail. Gateways treat their own bounces as well as bounces
from afar like other mail. I can't think of an alternative that would
be as reliable, not to mention practical.
Again, bounces need to be generated for more than just "user unknown."
Unless you can cram the entire Internet into an old style BBS, there
will be relays. As long as there are relays, you will have either
bounces or blackholes. Without bounces, all remote failures are like
blackholes. Who except spammers does not want to receive bounces for
their own mail?
Vernon Schryver vjs(_at_)rhyolite(_dot_)com
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