DKIM Checker

Check DKIM for a domain and selector, including key presence and parsed DKIM tags.

Results

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DKIM Checker retrieves a DKIM TXT record for a selector and domain, then parses the tags so you can verify that a public key is published.

Check whether a known DKIM selector is published correctly for a sending domain.
Verify key length and tag structure after rotating keys or changing providers.
Investigate DKIM failures after you already know which selector should be in use.

Analyze email headers for SPF, DKIM, DMARC, and routing clues.

Review SPF, DMARC, DKIM, MTA-STS, TLS-RPT, and BIMI together.

Try common selectors and discover likely DKIM records.

A practical guide to checking a DKIM record, finding the right selector, validating the TXT record, and spotting common DKIM setup problems.

A practical guide to fixing DKIM failures, including wrong selectors, missing records, bad key publication, and signing problems in email platforms.

Learn how to read DKIM records, understand selector hostnames and key tags, and spot the difference between valid publishing and weak configurations.