What tools check DKIM records?

DKIM record verification:

MXToolbox DKIM Lookup: mxtoolbox.com/dkim.aspx - requires domain and selector.

dmarcian DKIM Inspector: dmarcian.com/dkim-inspector - validates key format and content.

Command line:

dig TXT selector._domainkey.yourdomain.com

mail-tester.com: Send test email, verifies DKIM signature actually works.

What to verify:

Record exists at correct selector

Public key is properly formatted

Key length is adequate (2048-bit preferred)

No truncation or formatting errors

Test after key rotation or adding new selectors.

Verify your cryptographic seal is properly registered and verifiable.