Postmaster tools / domain reputation dashboard
The provider's own scoreboard for your domain: spam rate, reputation, and auth pass rates, straight from the inbox judging you.
See it
What it is
Free scoreboards the mailbox providers hand you for your own domain. Google Postmaster Tools shows user-reported spam rate, domain and IP reputation buckets, SPF, DKIM, DMARC pass rates, encryption, and delivery errors. Microsoft SNDS plus the JMRP feedback loop covers Outlook and Hotmail. Yahoo runs its own sender portal. Setup is a DNS TXT record to prove you own the domain, then you wait.
Reach for it the moment someone says 'our emails are going to spam'. Your sending platform can only tell you the receiving server accepted the message; Postmaster Tools adds the receiver's own read on you. What it does not do is say where an accepted message landed. There is no per-message inbox or spam answer in it, only aggregate reputation buckets, spam rate, authentication and encryption rates, and delivery errors. Treat it as diagnostic evidence, and when you need an actual placement estimate, pair it with seed list or panel testing. The number to watch first is the user-reported spam rate: Google's bulk sender rules want it under 0.10% and treat 0.30% as the line you must never cross.
Gotcha: no volume, no data. Gmail needs roughly hundreds of messages a day to your domain before charts appear, so a small sender stares at an empty dashboard. Data also lags a day or two, and reputation is scored per domain and per IP separately, so a clean domain on a filthy shared IP pool still lands in spam.
Ask AI for it
Walk me through wiring up sender reputation monitoring for my domain and build the internal dashboard around it. Cover verifying the domain in Google Postmaster Tools with a DNS TXT record, enrolling in Microsoft SNDS and JMRP, and signing up for the Yahoo feedback loop. Ingest two sources separately and label every chart with which one it came from: Google Postmaster metrics through its supported API or export (user-reported spam rate, domain and IP reputation, SPF, DKIM, DMARC and encryption rates, delivery errors), and our ESP's own delivery, bounce, and complaint events. Derive bounce rate only from the ESP data, never from Postmaster, and do not present any of it as inbox placement. Chart per sending subdomain and per week, draw 0.10% and 0.30% threshold lines on the spam rate, and alert me when it crosses 0.10% for two days running.