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 outbrain.com
Found
Selector: selector1
(TXT on selector1._domainkey.outbrain.com)
v=DKIM1;k=rsa;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCwtKauWyo8xzyH2aEbTT53JZbOnmrmNya5jSQQx0A5Hfe9eUwegMPIWQz2drA5mpve+PjOvZiqnuzaC3bs6YVkBQ6UA1HB+GwIpVQmu5ghwI9e8wzgYaSU1HMMr1wiDWhg+BvAmpRTQptREwxrY+d1sh/LwS0Nx4f0QG+jVQ4vjwIDAQAB
Selector: google
(TXT on google._domainkey.outbrain.com)
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCZH2zdM10oUvjUEJhmx8FuW+NO++Ov9ed624gMI0HHltfuXbT1CWzOluATuDK2lIN4PhbSPUQZKWA13U5hg2k/e3CrC/PXUwNwhHoSdY7KrUj1AraurhdOZW7yIO9sjRJqS5yb5CftpfjZHioZgdY/oAUxisLQT4o8/1qCHDq27QIDAQAB
Selector: mail
(TXT on mail._domainkey.outbrain.com)
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDK7zalftNnD+ifE1fsTBb8XJNk9gNhFYnjBq7SYizupqQj/s2jWFBk3RLFmQ8GChmTIK5vpWKbropLe/70Zm1DFXiSOx2ipVVwL07TKXy027YlWCymwV05wSypu3CFR2WqunDKwt3WiiZNU6R51qQZzv2fvZt3aYkwuQNXMtKtCQIDAQAB
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.