Free IT tools
A clearer view of
your email.
Check your domain’s SPF, DKIM, and DMARC records. Clear results, DNS details, and practical next checks.
FreeNo sign-upRead-only
Check a domain
Enter your email domain, without an email address or URL.
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Your diagnostic starts here
Results will appear after analysis. You can also explore fictional sample data without querying a domain.
Understanding results
Why do you need a DKIM selector?
Your sending service chooses the selector. Find it in provider settings or s= in a message’s DKIM-Signature header. d= identifies the signing domain to check.
Does the tool change my DNS?
No. It only reads public data. Validate changes against your sending sources and plan tests before applying a stricter policy.
Does a successful check guarantee delivery?
No. Reputation, content, routing, and recipient policies also matter. Testing an actual message remains necessary.