Free email deliverability checker.
Check any domain's SPF, DKIM, DMARC, and MX records in seconds. No signup, no email required.
Frequently asked questions
What does this tool check?
It looks up your domain's SPF, DKIM, DMARC, and MX DNS records and tells you whether each one passes, is missing, or has an error — the same checks that determine whether Gmail and Outlook trust your sending domain.
Is this free checker actually free?
Yes. There's no signup, no email required, and results are instant, though checks are rate-limited to prevent abuse.
Why did DKIM show as 'not found' when I have DKIM set up?
DKIM selectors are chosen by whoever set up your sending domain, and there's no public way to discover the exact selector without checking your sent mail headers. This tool checks the most common selectors used by major email providers and ESPs — if your provider uses a custom selector, it may not be detected here even though DKIM is correctly configured.
What do I do if something fails?
Each failing check includes a plain-English note on what's missing. For a full walkthrough of deliverability fundamentals, see our deliverability guide.
Want Warmerly to monitor this daily?
Warmerly checks SPF, DKIM, DMARC, and MX every day and alerts you the moment something breaks — plus automated warmup to build the reputation these records alone can't.