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DMARC Definition: DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email authentication protocol used to protect against domain spoofing and phishing attacks by verifying the authenticity of the sender's domain.
DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email authentication protocol used to protect organizations from email spoofing and phishing attacks. It allows senders to specify how their emails should be authenticated by receivers, and provides reporting mechanisms to detect and prevent unauthorized use of their domains in email messages.