Email troubleshooting guides
DKIM verification, organized by problem
Diagnose missing, invalid, pending, or incorrectly delegated DKIM public keys.
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Amazon SES DkimStatus PENDING: DKIM records not detectedFix Amazon SES DkimStatus PENDING by checking all three Easy DKIM CNAME records for the same identity and AWS Region.
Cloudflare: DKIM CNAME records are not resolving as expectedDiagnose a Cloudflare DKIM CNAME that is not verifying. Compare the provider-issued CNAME with public DNS and safely check whether CNAME flattening is hiding it.
DKIM public key record is invalid or revokedDiagnose an invalid or revoked DKIM public key record. Check the exact DKIM selector in public DNS before replacing a sender-provided key.
Microsoft 365 DKIM: CNAME record does not exist for this configCheck a Microsoft 365 DKIM CNAME record against the exact values issued for your tenant. Safely diagnose missing or mismatched selector1 and selector2 DNS records.
Primary sources: Primary technical reference.