DMARC Record
Checker

What is DMARC and Why It Matters

DMARC (Domain-based Message Authentication, Reporting & Conformance) is an email authentication protocol that builds upon SPF and DKIM to provide domain owners with a mechanism to protect their domain from unauthorized use, commonly known as email spoofing. DMARC enables domain owners to specify how receiving mail servers should handle messages that fail authentication checks.

Google and Yahoo DMARC Requirements 2024

As of February 2024, Google and Yahoo require all bulk senders (sending 5,000+ emails per day) to implement DMARC authentication. This requirement helps combat spam and phishing while improving overall email ecosystem security. Domains without proper DMARC configuration may experience significant delivery issues to Gmail and Yahoo Mail recipients.

DMARC Best Practices

• Start with p=none to monitor without affecting delivery
• Analyze reports for at least 2-4 weeks before enforcement
• Gradually increase policy strength (none → quarantine → reject)
• Use percentage (pct) to slowly roll out stricter policies
• Set up both aggregate (rua) and forensic (ruf) reporting
• Monitor third-party senders and add them to SPF/DKIM
• Keep alignment mode relaxed initially (aspf=r, adkim=r)
• Document all legitimate email sources before enforcement

Common DMARC Mistakes to Avoid

Many organizations rush DMARC implementation without proper preparation. Going directly to p=reject without monitoring can block legitimate emails from partners, marketing platforms, or automated systems. Always start with p=none, analyze your email ecosystem through DMARC reports, and gradually increase enforcement. Missing legitimate senders in your SPF and DKIM configurations is the most common cause of DMARC failures.