http://tweedge32j4ib2hrj57l676twj2rwedkkkbr57xcz5z73vpkolws6vid.onion/2020/email-fraud-or-email-compromise-beginners-guide
DMARC : Allows a sender domain to indicate that emails purporting to be from them must be using SPF and/or DKIM on a well-formatted From: field. DMARC also provides what to do if an email fails either check, as well as how to report violations back to the sending email server. Possibility A: Email Forgery Checking Alice’s email servers: SPF, DKIM, and DMARC are supported.