@kinnison@hisham_hm#SPF is the Sender Policy Framework, not "Sender Permitted From" and by design does nothing anything at all with the "From:" header. SPF only concerns the SMTP "MAIL FROM" line, which is not part of the actual email headers and thus is not and cannot be displayed by email clients. This is explicitly mentioned in the security considerations of the RFC: https://www.rfc-editor.org/rfc/rfc7208#section-11.2