DMARC (Domain-based Message Authentication, Reporting, and Conformance) is a DNS policy that builds on SPF and DKIM. It tells receiving mail servers what to do when an email from your domain fails authentication: ignore it, quarantine it (send to spam), or reject it entirely. DMARC also provides reporting so you can see who is sending email on your domain’s behalf.
DMARC has three policy levels: p=none (monitor only, no action on failures), p=quarantine (send failing emails to spam), and p=reject (block failing emails entirely). Start with none, review the DMARC reports to understand your sending sources, then graduate to quarantine, then reject once all legitimate sending is authenticated.
Without DMARC, phishers can send emails spoofing your domain, damaging your brand reputation and potentially triggering blocklisting of your domain. Gmail and Yahoo now require DMARC for bulk senders. Configuring DMARC is not optional for serious email marketers.
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