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 synapticmedia.net
Found
Selector: default
(TXT on default._domainkey.synapticmedia.net)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAs76dVSzP+49hvXI/29jfH8EZIjtBOL9ffDjqVbU1Rh8CcNIS00cib8WtiFreVH+M1AsHvSjjhPh0qZEfgVThxlgukfbTF+sJJe/99GzEUtmGvHwbo90FNgxTJ4uO2OTYDJdrL6wW1k5MivfKIv+Fhie8fXhaRwUZd5A/e1JLhCGmoDWE3mw7uFEDQGXmhbpfSUkpUdA9kMSDDOoyWhhEJb/r4EeuUVZz9zpEvDloo7wTDQ6AJj4RG3X9bLBKIS3RZX7KlX7F1kuHewpFfALUYHGAwN9utd7xb1xTTJX2m2y124BCm+9qQM+XtGPwtyB048dWjOA6N8Y7LOKJRZHigQIDAQAB;
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.