DKIM Record Checker
DKIM signs outgoing emails. Receivers verify the signature using a public key in DNS.
DKIM lives on <selector>._domainkey.<domain>. If selector is empty, we try common ones.
Result for adp.com
Found
Selector: selector1
(TXT on selector1._domainkey.adp.com)
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC5UUAJrHjxbrU6QQZhjopotC8TK5XsM9T9lKgGCDfs1ipY9OT9heqNZBa/1CKyJb+rsGr8wsSJcj8W5YrGkIubMRENKdPSLh8GmVtkng+tHvibJo1XVh7thIx5woE++un/Di3D/4LjlsbqPKnsv9wAMqrZ5wDWO4/LjIYxj8uC8QIDAQAB; n=1024,1476407264,1492132064
Selector: selector2
(TXT on selector2._domainkey.adp.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4UkC4WrMJc02FHvVAQidR9ptkJHwlKNbI8UGzi6fEoUV5Pt7/qFF5o9bKCSpxJ50HlGVGlpVoWZtawUc/0bRnQfvLQmxfguUYRWp336p8PG39gb3EY1c+6hfZlMEPT27RHlp4BNQmXRksZLSF7sWRoeXRROhk2IbbqXEy7fY9Hi4zgno1d+G6/C5XwB7BsLQfMAizlQqAVgPgbggIcP2Y6qxmAnhAIoC4fKgldkVqhYkxlm10sUyOhbj/J6IrYcPIq6/2WgVEPfCgPk5L6uOy7Xpr16uYAT4BVUSlJwjAfPUaS27jScvLkai/DMMNwDCVdT004BqETXSfTJ34B+RrQIDAQAB;
FAQ
Why does DKIM require a selector?
Selectors allow rotating keys and running multiple keys per domain.
Where is DKIM published?
TXT on <selector>._domainkey.<domain>.
DKIM record exists but emails still fail DKIM?
Signing may be disabled or the selector used in email differs from DNS.
Do I need DKIM if I have SPF?
Yes, many providers use both for best deliverability and DMARC alignment.
Can I have multiple DKIM selectors?
Yes, that is common for key rotation or multiple senders.
What is DKIM?
DKIM (DomainKeys Identified Mail) adds a cryptographic signature to outgoing emails. DNS stores a public key that allows receivers to verify authenticity.
Example
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0B...
Common mistakes
- Wrong selector (the record exists but under a different selector).
- Key is split incorrectly across multiple TXT chunks (some DNS UIs break it).
- Publishing DKIM but not enabling signing on the mail provider.