What’s Yahoo’s approach to authentication and DMARC?

Yahoo's approach to authentication and DMARC aligns with industry standards while emphasizing strict compliance. Yahoo requires valid SPF and DKIM for bulk senders, with DMARC providing the policy framework that determines how authentication failures are handled.

Yahoo honors DMARC policies as specified in DNS records. If your policy is p=reject, Yahoo will reject messages failing authentication. If p=quarantine, failing messages go to spam. Yahoo was an early adopter of DMARC and continues advocating for stronger authentication across the email ecosystem.

For senders, this means DMARC configuration matters significantly at Yahoo. Moving from p=none (monitoring only) to p=quarantine or p=reject requires confidence in your authentication setup. Yahoo's feedback through DMARC aggregate reports helps identify authentication failures before tightening policies.

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