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 tab.co.nz
Found
Selector: default
(TXT on default._domainkey.tab.co.nz)
v=DKIM1; h=sha256; k=rsa; s=email; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAu7nozA62ZjQjKJ8k4xX6tam46a/glI7Ias4/xIm7L9dxf8HkwVYLr7tI2zTsxy7mcw3JRjZ9QTbM88vvo54d6ey4wfTC07AAXTZwousJ0sqd2du7/PVvARYV/DojgVxejGgYCchq+V0p8AqzeQcBXg+xyVLOM1kIJa+3Y5DLaIldCtOF/RBIbSmziglTkHYm5GBGYtBlIr7egIaU2wUJRhGVZF433roSiOSE5qxrZ6MbnWWqplAu66pfhoaonr7+CpG1HLu8WwqQf1sDRR+mT3y2995ckVFYRAyPP1LUTCXAusCX9bRPxg8E/UtZnH3o1BPCgz8t/q8+5j7j/2db4QIDAQAB
Selector: google
(TXT on google._domainkey.tab.co.nz)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEApDvED+/Gu8ShDCR0e2PMBazTsh0Sg1ea28RRt3zMhDquvlKO0XLPg7n+Z2zTVaOrAS8nylwmRo/WL6H3/L+vjGGFddvRQJ7jsBCT3AfgoQPX+sE9O3lCkGKjkf51khi5LUij+Zh8TJXfQJ4PY5SQEpSKanuwGjrhSGRJVGEnWFNG7ZMRgQnWScK2r+WsHXEOL21UEKmlFd64NcgZAijLczBlHdcEhS/bwOT4KngnrIGxIYlpKjBkTOg1Jks6bdrxJ68hv2gfrBBdgJU1Jill83hyEN9n19zi0X8Jn6QO7+R2TA2AxIqF0tibE5nL+qyC3WcFt8ODdaxGou925EYdWQIDAQAB
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.