On the qmail list [EMAIL PROTECTED] wrote:
>Ah, but just because it comes from an open relay with a valid DNS entry
>doesn't mean the "From:" address is valid. That's what the patch at
>qmail.org checks, so it can bounce it to the original sender if it needs to.
Ah OK. That's a pretty unassailable requirement.
"In accepting a piece of mail I accept the RFC 821 "MUST"
obligation to send an error message to the error address if for
some reason I can't deliver it. I cannot resolve the error
address; I cannot therefore at this time send an error message
to the error address, and there is no reason to believe I will
be able to do so in the future; I therefore cannot accept
the obligation to send a message to that address in case of
problems; therefore, I cannot accept your mail."
