Auditing SPF and DMARC across many domains: why a 'pass' can still mislead

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Checking email authentication for hundreds of domains is often scripted, but many scripts report misleading results. The guidance covers reading SPF and DMARC TXT records correctly, including joining records split into 255-character chunks. It flags domains publishing multiple SPF records as broken and explains that a +all mechanism effectively means no SPF protection. It also notes that DMARC p=none only collects reports while enforcement requires p=quarantine or p=reject, and that a low pct value weakens enforcement. The article concludes with a safe record set for parked domains that send no mail and a Node.js approach for sorting domains into enforcement buckets.

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