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 mail365.info
Found
Selector: google
(TXT on google._domainkey.mail365.info)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxJGd0SI06/eFGN1syvqDLG1ACnI9NyMsmmhHEyLTFzz4LK2t4icNOyGiuA5SRAsiiqf7N4hvabLiJ4ZZ4idV4fziPZv413Uvkp9zrUW6xM4b3uWVrCAMzClGP+V6BN+9dFJrABGCbZ10OWDcgd3ukzz6kMCD9+QKdtsTyZuchgRbo3La/B4rHnx1JW3TgVYoT7CVcrvpbvpNkrZB3FgD4S9j1bs6qN1rFqYXweYaiRD/4E6qA52PL9e5/r9fU6jmvVmKK7zyEiRHOkI2jp+ByUuGUPtJhknncULTFzNmSZtRQVB8ZyR14HnZfGeT9yaXv4GSKiOa+K5Lbd95z0m1tQIDAQAB
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.