Angus March:
> > If sendmail(1) is unable to en-queue a message, it reports an error.
> > In all other cases (message en-queued), error reporting is asynchronous.
> >
> Well, that's the problem here. There was no bounce, obviously, since
> the sender was bogus, and sendmail's return value (as taken from
> waitpid()) was 0.
Unlike web apps or instand-messaging apps, email has a store-and-forward
architecture. It is by definition not possible to know all delivery
problems at mail submission time.
Wietse
