Ronald Guilmette told me,
| You misunderstood.
Thank you for explaining a little further, but I still don't understand.
| The response would go back to the original mail sender... not to postmaster.
So you do not notify the people operating the open relay that their relay is
open but rather you write to the originator (if you can find out who that is,
as spammers are fond of forging). Then the autoresponse isn't unsolicited,
and I see that now; while it may not come from an address to which the sender
wrote, it was a report on the transmission of mail that he or she sent. Now
I understand how it differs from an IMRSS notification to the postmaster at
the open relay.
But I'm still puzzled. What do you say in the autoresponse? "You used an
open relay"? The sender already knows that, so you wouldn't bother saying
so. "We know you used an open relay and you won't get away with it"? You
know as well as I do that that won't do any good, so you wouldn't say that.
What, then, do you say to the sender, and how can you be sure you're getting
the real sender and not a victim of forged headers or forged envelopes?
Also, if you aren't telling the operators of the open relay that their relay
is open, does anybody tell them?