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 maxitip.cz
Found
Selector: mail
(TXT on mail._domainkey.maxitip.cz)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvbQ+ssAA2QdJMsUt071ognV9qftN8L8Q2qDtZIljR7J7MYkl5LxBkpDe7DkxKZVUSagA1DlE5bSEOfYysyKpb7CLR53r3KkOxh1iq4sd4D9gKU0NRvn/4MtqczI71RKGKc7XdLAipyjY+Z2CIfPhvv9FqvvgANQQ/wh1JsnYQjUOYqXH2b7wt6wUJm/ePm1d3tZ9e11g4im6BEwWxO6LZ9Tr4BvM338WtA1hXALivsHyNcEFbmsbJMG+wHMctysWHixmzZdUrXoMND7E1h6tyOBGzrzOw6UXhpwGnTgw4RMXh9LeqwVBdrJoEK9pW8aZRiFxBEznUHpnwbV2cOUKlQIDAQAB
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.