Bill Cole:
> >so I guess the answer is to
> > tell him no, and if whatever it is is important, and he gets the
> > warning, to follow the message up with a phone call (he should be doing
> > that anyway for anything mission critical, but getting some people to
> > understand that email is not a 100% reliable communication medium is
> > sometimes difficult.
>
> He may get a little help from using the "Return Receipt" feature. That's
> done with headers and MUA's, so it is a bit less predictable than DSN's done
> at the SMTP level. On the other hand, DSN depends on all MTA's in the path
> supporting an extension to SMTP that some perceive as a threat to privacy
> and/or security.
If an MTA does does not announce DSN support, then the up-stream
MTA is required to send the positive notification. What you would
typically get is a notice that your message was given to the
receiving party's mail server.
Wietse
