On Wed, Mar 24, 2021 at 1:21 PM John Levine <[email protected]> wrote: > It appears that Gren Elliot <[email protected]> said: > >For better or worse, there is long established practice in the > Calendaring community when implementing iMIP (rfc6047) when an > >assistant is working on behalf of a manager for the manager’s email > address to populate the “From:” header and the > >assistant’s email address to populate the “Sender:” header. > > DMARC only looks at the domain part of the From header. How often do the > manager and assistant have e-mail addresses that > are not in the same domain? >
John, This goes back to your Roman Empire scenario. It's not necessarily common, but it isn't unheard of for domain mismatches especially in the case of acquisitions or other corporate structuring changes. --Kurt
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