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 uber.com
Found
Selector: google
(TXT on google._domainkey.uber.com)
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQD47RWlgqkIHUpMVRDcEDEtf0N2Oy4NieUMJfQRqnb9z6wU0rANdNZyM2Nb/4V0tfmgIm6bCe31nS0pRLvYtgul/G9v/K2ZVJoE2SEDzMSDKs5P++ASHmhNvqN8Ndt91Gbf8rpIW5d+Y7yya6QDzRJGGnvo84jVRne/OYpLVJPDPQIDAQAB
Selector: smtp
(TXT on smtp._domainkey.uber.com)
v=DKIM1; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCuzjFDdKs0YCQtdtXlRYuTvt/KX5inZRZIX6FE9a5Qa7g2pQxwS+AZ9wItGXqLZUbNpLDVZCN3JzXh1rAwGmt5bE8+AWp60yMKnvV+SrXxAnLGDchgJRQfKlpTpmdnkPrErurWgwwTW46z/UQTQi+/B9VJa5X8T5xClocvwOsASwIDAQAB
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.