On 18/12/2021 03:47, Douglas Foster wrote:
MX checks are a valid tool for assessing SMTP MailFrom addresses, since the sender is supposed to be ready to accept non-delivery reports and other automated messages. Of course, this has applicability if (but only if) the RFC5322.From domain is the same as the RFC5321.MailFrom domain.
I disagree. It is well-established practice for a mailing list manager to accept and process NDRs accepted on the 5321.mailfrom (which differs from the 5322.from). -- Cheers, Jeremy _______________________________________________ dmarc mailing list dmarc@ietf.org https://www.ietf.org/mailman/listinfo/dmarc
