I agree with Phillip that there should be some way to verify that the
accreditation covers the domain in question, not "anyone's" accreditation.
Is there a suggested format for TXT records that the bonded sender and
others publish, or should publish? IMO, it should be a short message
suitable for putting in the headers, possibly containing a URL to view the
accreditation statement for that domain, and/or where to report it if the
mail seems abusive.
--
Greg Connor <gconnor(_at_)nekodojo(_dot_)org>