Release notes · September 10, 2026
Google retired the original Postmaster Tools reporting model in favor of a new API. We’ve rebuilt Inbox Monster’s entire Reputation area on top of it. The result is a single, consistent reputation grade across Google, Microsoft and Spamhaus, plus much deeper Gmail diagnostics than we could surface before.
Everything lives under Reputation in the left navigation: Overview, Domains, and IPs.
What’s changed at a glance
| Before | Now |
Google data source | Postmaster Tools v1 | Postmaster Tools v2 |
Reputation grades | Bad / Low / Medium / High / Neutral | High / Medium / Low |
Gmail spam-rate detail | Single rate | Peak, average, and days above Google’s 0.10% threshold, with inbox placement overlay |
Delivery errors | Not surfaced | Temp fails, rate limiting and policy rejects, trended daily |
Google sender requirements | Not surfaced | Compliance status per domain |
Domain and IP views | Legacy tables | Rebuilt list and drilldown views, with AI summaries |
The three-band reputation scale
The biggest change you’ll notice is the scale. Reputation is now reported in three bands — High, Medium, and Low — everywhere in the product.
Google Postmaster v2 reports in these three bands natively. To keep a single, comparable scale across every source, we map the others onto it:
Microsoft SNDS grades map directly to High / Medium / Low.
Spamhaus grades map directly, with one exception: anything Spamhaus reports as Bad is rolled into Low.
This means a domain sitting at “Low” is genuinely at risk regardless of which provider flagged it, and the counts on the Overview page are directly comparable.
A note on history: because the underlying grading model changed, reputation history from before this release isn’t directly comparable to what you’ll see now. Trend charts are populated from Postmaster v2 data going forward.
Reputation Overview
Reputation Overview, reporting on the new three-band scale
The Overview page keeps the layout you already know, now reporting on the new scale.
Status Summary — a count of your tracked domains and IPs sitting at High, Medium and Low. Domains and IPs must be tracked in their respective settings sections to appear here.
Reputation Changes — every grade change on your tracked domains and IPs in the past 24 hours, showing the source (Google Postmaster v2, Microsoft SNDS), the previous and current grade, and the direction of travel. Searchable by domain or IP, and exportable.
Domains
The domain list, filterable by reputation band
The domain list is filterable by band (All / High / Medium / Low) and searchable by domain or label. Each row shows:
Reputation — the current three-band grade
Deliverability Analysis — Google’s sender-requirements compliance status
Spam Rate — the latest Gmail user-reported spam rate
Reputation Trend — a rolling sparkline of recent daily grades
Last Reported — when Google last returned data for the domain
The whole list exports to CSV.
Domain drilldown
Domain drilldown, Overview tab
Clicking into a domain opens a report organized into five tabs, with the current grade pinned to the header and an AI Summary at the top that reads the underlying data and tells you what’s actually going on.
Overview — the reputation trend for the last 31 days (adjustable), with daily grade bars and a Gmail inbox placement overlay. Four headline figures sit above the chart: current reputation, current spam rate, average inbox placement, and days spent at Low in the selected range. Below the chart, Google Postmaster V2 Compliance Scores reports your status against Google’s sender requirements.
Complaints tab, showing Gmail spam rate against the 0.10% threshold
Complaints — Gmail spam rate and inbox placement with threshold annotations, sourced from Postmaster v2. Shows your peak and average spam rate for the range and, importantly, how many days you spent above Google’s 0.10% ideal.
Errors tab, new in this release
Errors — new in this release. Delivery and policy error trends from Postmaster v2: temporary failure rates, rate limiting, and policy rejects, trended daily. This is the data that tells you whether Gmail is throttling or refusing your mail, rather than simply filtering it.
SNDS — per-day complaint rate and reputation grade from Microsoft SNDS, aggregated across every IP bound to the domain, against Microsoft’s 0.20% warning threshold.
Spamhaus — daily domain reputation grade from Spamhaus, plus the detailed data points Spamhaus holds on the domain. Not every domain receives Spamhaus reputation data across all categories.
IPs
The IP list, powered by Microsoft SNDS
The IP list has been rebuilt to match, filterable by band and searchable by IP or label, showing SNDS reputation, a rolling trend sparkline, average complaint rate and last reported date. Exports to CSV.
IP drilldown, Overview tab
The IP drilldown carries an AI Summary and three tabs — Overview, Complaints and Errors. IP-level reputation is sourced from Microsoft SNDS: Google Postmaster v2 reports at the domain level only. The Overview tab gives you the current grade, average inbox placement at Outlook, average complaint rate and days at Low, followed by a day-by-day table of grades and complaint rates that you can filter and export.
Connecting Google Postmaster Tools v2
If you were connected to Postmaster Tools before this release, you'll need to re-authorize your connection against the v2 API. Until you do, domain-level Google data will show as unavailable.
Connecting takes a minute:
Confirm the domains you want tracked are added under Settings → Domain. Google only returns data for domains you’ve verified in Postmaster Tools, so the domain must exist in both places.
In Inbox Monster, open the settings menu (the gear icon, top right) and choose Setup and Integrations.
Select Integrations from the left-hand menu.
Settings, Setup and Integrations, Integrations
Click the Google Postmaster tile. You’ll be redirected to Google to sign in.
Sign in with the Google account that owns your Postmaster Tools domains and grant Inbox Monster read access.
You’ll be returned to the Integrations page, where Google Postmaster will now be listed with its last-connected time.
Which Google account? Use the account that verified your sending domains in Google Postmaster Tools. If several people in your organization have verified different domains, connect the account with the broadest coverage, or verify all domains under one account first.
When will data appear? Google backfills recent history on first connection, then updates daily. Give it up to 48 hours before a newly connected domain shows a full trend. Google also suppresses data for domains below its minimum daily volume threshold — low-volume domains will show “Not enough signal” until they clear it.
Microsoft SNDS and Spamhaus
Neither changed in this release, but both now report on the same three-band scale.
Microsoft SNDS is connected from the same Integrations page via the Outlook SNDS tile and powers all IP-level reputation.
Spamhaus requires no connection; domain reputation data is pulled automatically for tracked domains.
The legacy view
The previous Reputation area remains available as Reputation (Legacy) in the left navigation during the transition, so you can cross-reference while you get familiar with the new views. It runs on the retired Postmaster v1 data feed and will stop receiving Google data. We’ll confirm a removal date separately.
Questions
Reach out to your account team or use the in-app chat. If a domain isn’t reporting after you’ve connected Postmaster v2, the two things to check first are that the domain is verified in Google Postmaster Tools under the account you connected, and that it’s added under Settings → Domain in Inbox Monster.