DMARC

An email authentication standard that tells receiving mail servers what to do with messages that fail sender-verification checks.

DMARC (Domain-based Message Authentication, Reporting and Conformance) builds on SPF and DKIM to let a domain owner specify how unauthenticated email claiming to be from their domain should be handled: quarantined, rejected, or allowed with reporting. Properly configured DMARC significantly reduces the effectiveness of email spoofing used in phishing and business email compromise.

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