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Google Postmaster Tools — What It Shows and How to Use It
Postmaster is Google’s side of the story: authentication pass rates, encryption, spam rate — for domains you verify. It does not replace DMARC XML — it complements it.
What to watch
Sudden drops in domain reputation correlate with list purchases or auth breakage. Cross-check DNS changes with the timeline.
FAQ
Do I need to verify?
Yes — add DNS token or file to prove domain ownership.
What is IP reputation vs domain?
IP history for your sending IPs vs authentication + spam rate for the domain.
Does it fix delivery?
It diagnoses — fixes are still SPF/DKIM/DMARC and list hygiene.
Free?
Yes for qualified senders — volume thresholds apply.
Yahoo equivalent?
No single clone — use DMARC reports and seed inboxes.