Email tool
DMARC / DKIM / SPF Checker
Check a domain's email authentication records across common DKIM selectors.
Enter a domain to look up its published SPF, DMARC, and common DKIM selectors over DNS.
Frequently asked questions
Why didn't the DKIM check find my selector?
DKIM selectors are defined by your email platform and are not standardized across providers. This tool probes 11 common selectors used by Google Workspace, Microsoft 365, and popular ESPs. If your sending platform uses a custom selector name, it will not appear here. You can find your exact selector by inspecting the DKIM-Signature header in a sent email, then re-query with the correct selector using a DNS lookup tool.
My domain has SPF but email still gets flagged as spam — why?
SPF alone is insufficient. Without DMARC, even a valid SPF result does not prevent spoofed From: addresses from reaching inboxes. DKIM provides cryptographic proof that the message body was not tampered with. DMARC ties SPF and DKIM together and tells receiving servers what to do with unauthenticated mail. All three layers are required for robust email deliverability and anti-spoofing protection.
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