Google Postmaster, Microsoft SNDS and Sender Score: Watching All Three From One Screen

Gmail’s spam rate for your domain ticked up yesterday, and you only found out because a client forwarded a screenshot of your email sitting in their junk folder.

You’ve been opening Google Postmaster, Microsoft SNDS and Sender Score by hand every morning.

Three logins, three date ranges and no alert between them means the change is a day old before anyone looks.

The next five minutes cover what each of the three sources actually reports, and how InboxStack watches all of them and alerts you on the change.

If you’re reading this because a client saw the spam folder before you did, you’re in the right place.

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What each source tells you

Google Postmaster Tools is the only direct view of how Gmail scores your domain. InboxStack reads it and shows your domain reputation, spam rate and whether SPF, DKIM and DMARC are passing. Pair those numbers with a seed test and you can see both what Gmail thinks of the domain and where the mail actually landed. This matters more since the Google and Yahoo sender requirements raised the bar for bulk senders.

Microsoft SNDS is the equivalent for Outlook and Hotmail. It reports by IP range rather than domain. InboxStack reads SNDS alongside Postmaster, so a problem that only shows at Outlook is visible on the same screen as the Gmail data.

Sender Score is a single score for your sending IP across a wide range of ISPs. A low score is an early warning that mail is about to start landing in spam. InboxStack reads it as the third input.

What InboxStack does with them

It reads all three on a schedule and keeps them in one place with your ESP’s bounce and complaint data. You set alerts on the things that matter — a drop in Gmail’s domain score, a spam-rate rise, a Sender Score fall, or anything that moves outside its normal range — and the alert reaches you before the client does.

That’s the whole product for this use case: one screen, three sources, and an alert when any of them changes. If you want the difference between inbox placement and the wider question of whether mail gets through at all, read inbox placement vs. the rest of the chain or what inbox placement means.