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 opap.gr
Found
Selector: selector1
(TXT on selector1._domainkey.opap.gr)
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDekh9EGtJY39iAXwegCN64oRA4j8QhOv6CSPJ15DTuDL/tEK+dVAWxZj0Wm1nJvbArAREWWpdf8SaDtdqVFCWFCwkPy4/BwzzfHoNdnl7SmPIqpBsLa8+NyuF1hB0wQJ/6f5twNSTlJpOkoqUABVncVmAZooCfuUWAiO6dtZYBQQIDAQAB; n=1024,1450842094,1466653294
Selector: selector2
(TXT on selector2._domainkey.opap.gr)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6b3r+VAznTa016BUVS/KuINELcx4l1BBP4DZuIIHvyUir7sLP1ktRIrSJDXlK2JAfQ4LKwoz0pUBxUv48TQdS7DaeiK9EwMkN8aRkJZkkMzGQdMRJP9wmB1rgBdi4tTMGitREqg/flz0Woc7Kuso/1Zohh+G+qRzHlvLwLq7C9EOaNzqobys6d+IOYqnFfTjl1FQWt0hMZw2YDKXzf3dqhmt8SLMOAlDymSOeGUUYhY9hk4uEA+DRz/LkvM56iq73PXTLEUfi+VWu/9HnC20BatjZCrDDtyxL+eJMP9yHB/w2ys6iOCEUMY5YhEvoYy9bYmBQkBG6Ydp6R1CUCh69QIDAQAB;
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.