Blocks you outright
MX and SPF
No MX means nobody can reply to you, which filters treat as a warning sign. No SPF, or more than one SPF record, means the check fails before it starts.
Deliverability fails quietly. Your reports keep showing sends, your reply rate drops, and nothing in the tool tells you why. This reads the same records Gmail reads, in about a second.
Type your domain. We read the same DNS records Gmail reads before deciding where to put your email. Since February 2024 three of them are required. Most domains we check are missing at least one, and nobody ever told the owner.
Live DNS through a public resolver. Nothing is stored and nothing is sent to your domain.
No MX means nobody can reply to you, which filters treat as a warning sign. No SPF, or more than one SPF record, means the check fails before it starts.
Present or absent, and if present, whether the policy is none, quarantine or reject, whether reports are collected, and what share of mail it applies to.
We check thirteen selectors used by the common providers. A private selector will not be found, and that is a limitation of the check rather than a fault in your setup.
This is a teaching tool and our reading of standard practice, not advice for your specific setup. Check anything important with your own specialist before you change DNS.