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 trello.com
Found
Selector: google
(TXT on google._domainkey.trello.com)
v=DKIM1; k=rsa; h=sha256; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAknFfSvqzoy9bgyUE6d8ZuiGwzHOj+ROt0eavk9UhGdFpnB4iH0s8Qu0YHCP3M1N3L36FMOaGmuWHkxwt1Ex3R5W4FOAwN76VvmaSxU7YEQX4JiYk2IvkTlGCjP5GTpJWnK+9vc2af+c2BTMgpEmNP3O7E1mJU/cH7+bY8hsniI9txD9K/CcOsUTak2C2p+J02iLGgIX16iIqI5HHcMs34irmNxpHo9iqRSqzYEqPILDOAqAoXVOgHU5rhvLacSk+JWW1DIApDPyNdlS444StF8ycBqLXNkG2w0gOeZ5TMbHRmm5+mK7N7xaU+5sullly3Xw5qPig8vZRP/cAAJeaNQIDAQAB
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.