How to Check Domain Reputation, and Why a New Domain Shows Nothing

When you check domain reputation, you are reading a rating a receiving mailbox provider has already assigned to your sending domain, based on mail you already sent. It is an output, not a setting. There is no field to correct and no vendor who can raise it on your behalf, which is the part most reputation advice quietly skips.

The disclosure first. We build Keaz Signals, which sells ecommerce store data with dated buying signals attached. We are a competitor to the companies selling contact lists by the row, and we have an obvious interest in you concluding that who you send to matters. Read the rest with that in mind.

There is also no single number called domain reputation. Each mailbox provider keeps its own view and publishes as much of it as it chooses. Google publishes a coarse rating for one slice of your mail. Others publish nothing and infer what they need from the same behaviour. So "my domain reputation is good" is always shorthand for "one provider currently rates one slice of my mail well".

Google publishes four reputation ratings, and its own definitions are short enough to quote in full. Retrieved from Google's Postmaster Tools dashboards documentation on 23 September 2026:

• Bad: "History of sending a high volume of spam regularly. Email from this domain or address is almost always marked as spam or rejected by the receiving server."
• Low: "History of sending a significant volume of spam regularly. Email from this domain or address is likely to be marked as spam."
• Medium: "History of sending legitimate email, but occasionally sends spam."
• High: "History of very low spam rates, and complies with Gmail's sender guidelines."

Two boundaries are stated alongside them and matter more than the wording. The rating covers only mail sent to personal Gmail accounts, meaning addresses ending @gmail.com or @googlemail.com. And it is displayed for domains sending DKIM-authenticated mail, falling back to SPF where DKIM is absent.

A new cold email domain usually returns no reputation at all, and that is by design rather than a fault. Google states that to protect the privacy of Gmail users, its dashboards "might not include all data on days when your outgoing email volume is low". Careful outreach is low-volume by construction, so the sending pattern you are told to aim for is the one the tool can see least.

Two more gates sit in front of the same check. The domain has to be added and verified in Postmaster Tools before any data appears. And the mail has to be authenticated, which is why the reputation question collapses into the authentication question set out in what SPF, DKIM and DMARC actually prove.

So the honest answer to "how do I check my domain reputation before I start" is that you cannot. Reputation is built from sending history, and a domain with no history has none to read. Warmup is often sold as the fix for this, and it is not: it builds history, which is different from building a good one. That distinction is the subject of email warmup and the limits nobody publishes.

The dashboard most people mean when they say "check domain reputation" is being removed. Google states that all the dashboards in the old Postmaster Tools are available in v2 "with the exception of the Domain and IP Reputation dashboards, which will be retired", and that the new v2 API "will encompass all existing v1 functionality, except Domain and IP reputation". Retrieved 23 September 2026.

Google gives three reasons, and they are worth reading as an admission about the metric rather than about the interface. Reputation data "is not easily actionable for most senders". Changes in sender behaviour "are slow to reflect in the existing dashboard". And the current dashboard "can be misleading as reputation is only one of many factors affecting deliverability".

Timing is unsettled and we are not going to pretend otherwise. On the same page Google says it is postponing the deprecation of the legacy web interface after sender feedback, while still directing senders to v2 and confirming that the v1 API is retired now that v2 has launched. A replacement reputation view is promised without a date. Anyone planning around this should read Google's page rather than ours.

We are not going to tell you what reputation rating is safe for cold email, or what spam rate you can run to, because we did not measure it and a threshold invented here would be the most persuasive dishonest thing in this article. We do not own your sending. Campaigns run through Instantly, in your own workspace, on your own domains and mailboxes.

That also rules out publishing our own inbox placement, bounce or reputation figures. We have not measured them for publication, and a number taken from our own outreach would describe our offer to our market, not yours. Nobody else writing about this metric has measured it for you either, whatever their landing page implies.

And there is no guarantee anywhere in this. A High rating is a description of past sending, not a promise about the next campaign. Google's own troubleshooting list includes the case "spam rate is low but reputation is poor", which is a useful reminder that these readings disagree with each other in normal operation.

Nor is any of this legal advice. We are GDPR-conscious by design and will not claim more than that. Responsibility for what you send stays with you.

Every input Google names as feeding reputation is a recipient behaviour: messages marked as spam, messages filtered as spam, unauthenticated mail, sending from suspicious domains. None of them is a sending setting. They are all consequences of who received the mail and whether it was worth their attention, which puts list selection upstream of the metric you are trying to read.

This is where we have a product opinion and an interest. We watch 4.1 million Shopify and WooCommerce stores across the EU and North America, re-scraped weekly, as of September 2026. On 23 September 2026 our ecommerce leads database reported 41,200 of them carrying a fresh buying signal from the last seven days. Those figures move, which is why they are dated.

The claim is narrow. Writing to a store in the week it launched a product or turned on new Meta ads gives the recipient a reason the message is in front of them, and that is the variable a reputation dashboard is measuring the downstream effect of. The buying signal catalogue lists what we watch. That is a structural argument about where the inputs come from, not a claim that we can move anyone's rating.

If what you need is a daily reading across Gmail, Microsoft and the blocklists in one screen, with alerts when something moves, buy a monitoring tool. We do not sell one, and we do not sell mailboxes, domains or warmup. What such tools see is covered in what email deliverability tools can tell you, and Google's own tool in reading Google Postmaster Tools.

Our coverage limits matter too. If your buyers are not Shopify or WooCommerce stores, or sit outside the EU and North America, they are invisible to us whatever they did this week. We have no LinkedIn signals and no LinkedIn sending. Hiring signals and registry triggers are marked planned, not shipped.

If the trade looks right, build a segment on the ecommerce leads database and see how many stores moved this week.

• Postmaster Tools dashboards, Google. Source for the four reputation ratings quoted verbatim, the DKIM and SPF condition, and the low-volume privacy gate. Retrieved 23 September 2026.
• Deprecation of the old Postmaster Tools interface, Google. Source for the retirement of the Domain and IP Reputation dashboards, the three stated reasons, the v1 API retirement and the postponement. Retrieved 23 September 2026.
• Ecommerce leads database, Keaz Signals. Source for 4.1M stores, weekly re-scraping and the 41,200 with a fresh signal. Retrieved 23 September 2026.
• No competitor figures, no third-party reputation benchmarks and no placement claims are cited. That is deliberate, and the reason is three sections above.