Read the homepages in this category and they converge. Everyone is 99% accurate. Everyone removes spam traps. Everyone protects your sender reputation. Nothing distinguishes any of them, including the ones that are genuinely good.
That convergence is an opportunity rather than a problem. When every vendor makes the same unverifiable claim, the one making checkable statements is the one a careful buyer can evaluate.
So we publish the limits. Catch-all domains cannot be verified at mailbox level, by us or anyone. Yahoo and AOL accept every probe by policy. Pristine spam traps are undetectable and we do not claim to remove them. We have not run our benchmark, so we publish no accuracy figure. Port 25 is blocked widely and probe quality depends on IP reputation.
Every one of those is checkable by someone technical, which is the point. A buyer who confirms three of them tends to believe the fourth.
What it costs
Buyers who want a simple number leave, and there are a lot of them. A page that says roughly a third of your business list cannot be resolved by anyone is a harder sell than a green badge saying 99.6%.
Comparison tables built by other people put a percentage next to every vendor and a blank next to us, which reads as a gap rather than as a refusal.
It is slower. Trust built by verifiable statements accumulates over months, where a headline number converts today.
What it buys is a customer who is not surprised. Someone told upfront that their Yahoo addresses will come back unresolved does not file a support ticket about it, and does not conclude the product is broken.
Where this argument costs us something
The short version
- Ask a vendor what their product cannot do, and judge the answer.
- Treat a checkable limitation as evidence of care rather than weakness.
- Notice which vendors decline to publish a number they could easily invent.
Questions people ask
Why publish limits at all?
Because they are checkable and the claims in this market are not. A buyer who confirms the hard statements tends to trust the rest of the page.
Does this mean the product is worse?
It means the constraints are stated. Every verifier faces the same ones, and the difference is whether they appear on the homepage or in a support ticket after you have paid.