Free tools — no signup required
Free email authentication tools
One-off checks for SPF, DKIM, and DMARC. Connect CleanMarc for continuous monitoring and 1-click fixes instead of running these by hand.
SPF Checker
Check any domain's SPF record for syntax errors, too many DNS lookups, and weak fail policies in seconds.
Try itDKIM Checker
Coming soonValidate a domain's DKIM selector and public key so you can confirm signed mail will pass authentication.
DMARC Checker
Coming soonReview a domain's DMARC policy, alignment settings, and reporting addresses for gaps that let spoofed mail through.
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