What DMARC Protects You From, and What It Does Not
The DMARC email authentication protocol is often misunderstood as a comprehensive security solution against phishing and spam. This article clarifies that DMARC only verifies domain ownership and authorization, and should be used alongside other security controls.
DMARC gets asked to do a lot of jobs it was never designed for. Teams reach for it as a spam filter, a phishing filter, and a general trust signal. It is none of those. The current DMARC protocol, defined in RFC 9989 , answers a deliberately narrow question: did the owner of the domain in the visible From address authorise this message, and can that authorisation be established through an aligned SPF or DKIM result?
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