David Woodhouse <dwmw2(_at_)infradead(_dot_)org> wrote:
Generally, what isn't delivered should be rejected by the first
recipient it's offered to. It never leaves the spammer's machine and
there's no bounce.
As has been pointed out repeatedly, this won't work in the existing
SMTP system, due to certain design and implementation decisions.
Whether this means the current design is incorrect, or your idea is
incorrect is an argument which will never end.
For related questions, what happens when I forward email manually,
and it bounces back to me? Is it legal for me to delete it, or should
I in turn bounce it to the originator who sent it to me? How does
this scenario differ from the automated forwarding process? Is it
legal, ever, for a part of the email system to discard a message? If
so, why? If not, why not?
This is why you should always have MX backups which are capable of
rejecting mail to unknown users at the domain, for example.
Ideally, yes. This can be difficult to do in practice.
Alan DeKok.