DMARC is a type of email authentication protocol that leverages the widely used SPF and DKIM protocols to improve a sender’s understanding of how their email in circulation is processed.

Email claiming to be from their domain is analyzed by receiving organizations and a digest of acceptance/failures is sent back to the sender. DMARC is used to reduce spam and fraudulent email by giving senders information on what recipients see. DMARC stands for Domain-based Message Authentication, Reporting & Conformance.
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