What is DMARC?
DMARC, which stands for “Domain-based Message Authentication, Reporting & Conformance”, is a way to determine whether an email message is legitimately from the sender or not. It builds on the widely deployed SPF and DKIM protocols, and adds domain alignment checking and reporting capabilities to designated recipients, to improve and monitor protection of the domain from nefarious spoofing attempts.
Here is an illustration from https://dmarc.org:
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