"Graham" == Graham Murray <graham(_at_)webwayone(_dot_)co(_dot_)uk>
writes:
Graham> Which is why it would be better for the MTA to create a
Graham> header to inform the MUA of the PRA and for the MUA to
Graham> display that. If this were done then it would be necessary
Graham> to specify that the MTA MUST remove any such headers
Graham> already in the mail.
I think this has the potential to make things worse (or at least more
confusing) where a Sender ID aware MUA is used with a non-Sender ID
MTA.
-roy