> DMARC = telling receivers how to handle mail that fails authentication.
replyNo. DMARC is about if the from address has to match the address used in dkim/spf
No DMARC is about telling receivers which of SPF/DKIM are valid, what to do with it when it fails, and where to send a report to. Oh look.. like Mike said.
replyTo be clear, I am saying this is incorrect.
replyDMARC is primarily about "alignment" (switching SPF from caring about the envelope sender to instead using the from header). Yes, it does also tangentially address those other points, but the primary reason it was adopted was to prevent spoofing of from headers (where in original spf that was a non-goal)
> You adopted it the moment it was announced? Really?
replyA specification exists since 2012, 14 years ago. 10 years ago it was already old.