What does the Gmail reputation graph actually mean?

You log into Gmail Postmaster Tools, pull up the domain reputation graph, and see a colored bar sitting somewhere between High and Bad. What does that actually tell you, and what should you do about it?

The graph tracks how Gmail perceives your sending domain over time, using a reputation system. Until September 2025, this was a four-tier scale (Bad, Low, Medium, High). Google replaced it with a simpler v2 Compliance Status that shows either Pass or Needs Work. If you still see the old four-tier view, that data is historical. The current system focuses on whether you meet Google's sender requirements rather than ranking you on a sliding scale.

The graph view (not just the current snapshot) is where the real value is. If your reputation drops on a specific date, you can cross-reference that with a campaign you sent, a list segment you added, or a spike in your spam rate. That correlation tells you what caused the problem, which is far more useful than a single-day reading.

What actually feeds this reputation score? Gmail looks at a combination of signals: complaint rates (how often recipients mark your mail as spam), engagement (opens, clicks, and the absence of quick deletions), and whether your authentication is properly set up with SPF, DKIM, and DMARC. A single bad campaign won't tank you permanently, but a consistent pattern of low engagement or high complaints will.

One thing worth noting: Medium is not a stable resting place. It means Gmail is watching. Senders who stay at Medium and don't act tend to drift toward Low over time, not climb back to High on their own. If you're sitting at Medium, that's the time to clean your list, suppress non-openers, and check whether your complaint rate is creeping up.

You can check your authentication setup with our free SPF checker or DKIM lookup. If your reputation has already dropped and you're not sure what triggered it, our SOS hotline is free and we'll help you work through it.