Google Postmaster Tools

Google’s free dashboard for senders: how Gmail sees your domain, spam complaint rate and whether you meet its bulk-sender requirements.

You verify the domain with a DNS record and then see data once your volume to Gmail is high enough. The compliance view checks the sender guidelines: authentication with SPF, DKIM and DMARC, one-click unsubscribe for marketing mail and a user-reported spam rate kept low, with 0.3% as the line not to cross. A failing item there explains a sudden drop in delivery better than guessing.

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Related terms

DMARC: The policy that tells receivers what to do when mail fails SPF and DKIM, and where to report.
Spam trap: An email address no real person uses, kept by a mailbox provider or a blocklist operator to catch senders with poor list practices.
One-click unsubscribe (RFC 8058): A standard way for mail apps to unsubscribe a reader with one POST request, required by Gmail and Yahoo for bulk senders since 2024.

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