I have a frozen bounce message on one of my servers running Exim that won't
deliver the email because the sender's address was unroutable
(<NRG710@???>... Sender domain must exist). The bounce was
generated by a machine running Sendmail MTA. I'd quite like to forward this
bounce message to postmaster@??? to alert them about it. What's the
best way of doing that? I was guessing at a -M? option, but couldn't find
one in the spec.
