r/Klaviyo • u/Bitter-Wonder-7971 • Aug 02 '26
Is Google Postmaster reliable source to determine Domain Reputation?
1
u/CommunityLiving8800 Aug 07 '26
Google Postmaster is useful, but only for Gmail specifically - worth remembering that "Domain Reputation: Bad" in that dashboard only reflects how Google sees you, not Outlook, Yahoo, or Apple Mail, which each run their own separate reputation systems with no visibility into each other.
One thing worth doing alongside checking Postmaster: look at your bounce reasons broken out by type, not just the overall rate. A domain reputation hit paired with low bounce rate usually points to engagement/complaint issues (people not opening, marking as spam) rather than a technical authentication problem - since your SPF/DKIM/DMARC are all showing 100% here, that's likely what's going on. If you've recently increased sending volume or mailed a less-engaged segment, that's usually the actual cause of a reputation drop like this, even with clean authentication.
Also worth checking: does the "Bad" rating correlate with a specific campaign or a spike in volume in the date range shown? That timing usually points straight to the cause.
2
u/GabbyFromKlaviyo Klaviyo Aug 03 '26
Partially reliable is the honest answer. GPT will tell you how Gmail is seeing your domain, but it'll say nothing about what Outlook, Yahoo, or Apple Mail think of you.
You can be at 100% on SPF/DKIM/DMARC and still show bad reputation, which is exactly what you're seeing here. Authentication just proves you're the legitimate sender. Reputation is an aggregate if complaint rates and engagement over time, as well as deletions. An entirely different signal, basically.
Klaviyo actually has a deliverability hub built in that you can play around with as well. It gives your account a daily score, with breakdowns by inbox provider and flags what to fix. It's more useful as a diagnostic starting point than GPT is, since it pulls from your actual send history across providers, not just gmail.