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Free email deliverability checker
SPF, DKIM, DMARC and MX on your sending domain, in about ten seconds. It runs in your browser, and nothing is stored.
What it checks
The four records every cold email domain needs.
- SPF. Whether there is exactly one record, whether it stays under the 10 DNS lookups allowed, and whether it ends in "+all", which would let any server send as you.
- DKIM. Whether a signing key is published at the common selectors used by Google Workspace, Microsoft 365 and the usual sending tools.
- DMARC. Your policy (none, quarantine or reject) and whether reports are being sent anywhere.
- MX. Whether the domain can receive replies at all.
What it can't see
A clean result doesn't mean the inbox.
In one audit, all 67 sending domains passed every check above, and the mail still went to spam. Domain age, bounces, volume per inbox and the tracking pixel decide the rest.
Questions
About the checker.
Is the checker free?
Yes. No sign-up and no email address needed.
Is my domain stored?
No. The check runs in your browser and only the domain name is sent to Google Public DNS to read its public records. Nothing reaches me unless you choose to email the result.
If everything passes, why is my cold email still in spam?
Because authentication is only the first gate. Worn-out domains, bounces, volume per inbox and the tracking pixel can still send you to spam with a perfect setup. That is what the audit looks at.