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 centralhydraulics.biz
Found
Selector: default
(TXT on default._domainkey.centralhydraulics.biz)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA14FHmo9913Y0VV9OrmlGdE5+oWZDohIoFh+Q7KtW58/1a0KhR57PTKkrFTZpB5Gh0LU75u+eOuCbuFNw6iYygei9HctggvcZO85oLYUbc5wVQKBzpeo6dEB4QOMouccx7p9deuqCjWl6Zh7eyqAy6d5iD7aQsZkUR4WbzOtxWF2QEY4PybXL6VBuLItSoMJbTPbWoZ7jI5hSimCA4D1vQNKfkhrUCUUqlp7+hLEBe9ObCuL1qd3tTcce9vvtm5yHXqndNaV1UgXEJVzO31nNdJe1DIED31R1NoFozyMxaGakmc9NcIzw7MJitzZwPNCWcDUR1sa9vIQ/guD2Grx5wQIDAQAB;
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.