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 mlb.com
Found
Selector: selector1
(TXT on selector1._domainkey.mlb.com)
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC7y0tAGs62oH6XrCYHUctOMs/t4AkYWnX+QhCCcnH4XqouTQifrKkYFZ9wewK+SGY2LyyUjL8DR8BWsX2z5cZlqUvX0/8/gYpp82OFtWGXIl/VtC3IP0/sAiA1EZrG8zuKRfIWIcbIjmVvF/I9F0nRRyyV2/flCK02TBTDYQ/S7wIDAQAB; n=1024,1460564825,1476376025
Selector: selector2
(TXT on selector2._domainkey.mlb.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyL8p6CRzbosxk0YEoVnezEBcjX83YfEuT5Seyd/w+M24l6FnPoMxt3fMiel16K7J9goZsTpAy4MOYztoWcF01ZzyareEfswHnfQLsY2F52cJEVnrDfo7Jb39dQZkwrjh8AThDtJeOZiIaxTRaI/LMDR+dp5oxHUuEfrQ6LBJIatVdq0PArh6RfANsFGK76mSrD0o0vkaS7KVNcmOikbuEB4sQHpP6WWhETXIOlsLgp5Adt6Q5vgAWttliolmOvDNIJn0acMmSVsOuZsvZH79ZTFnmSfzYcyC+Pxx1KarH/PxdzYNLYgwrAj06gr/fF0YQff8lXC7hEXm2aTOvJCxhQIDAQAB;
Selector: google
(TXT on google._domainkey.mlb.com)
v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAg2cxM0p7ZX5CvaY/coVuy/w88yE3nK3k2wGmb5qiwqGxk8uIrixDH7SzxnoahYs/RFuIutup4ritHEX8DPl5q192fV1FsyD0UJ52dR5DqSTe62Mwco5bAQFt3yTSd/nf7AbF/Ucset0um7p7OoOJ5yUvij/yrBhN2HkcTUTl9O/duFfSRhMg0vJ2ZVOIbsZPwqSCYn83S1UPJlgFrOs7em8dqgdt1TLZhKo1RCrGry6mhU2sgpPTLbbsO6KN8ioFGY1qUq7QrtDnOWTkof0GHm3O2IFToXYK6T91NDXIys5csYlKcCoF/HPCZ5ZTF+s1YfJ/BpDLWuZsGhcXdvbbNwIDAQAB
Selector: smtp
(TXT on smtp._domainkey.mlb.com)
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCxVvPVgWeAFDvo84fFVzdR6iUidOe3/Wuotd69Z9QBkpv+cZd9KoxaToGtVapmZNrw0+l3iSW1JFlr58hAeGqmmAd6kLxG/GZC+24fHcfi5evZyEfBNgfmVrTw7TKW6RGcfDmuI3zDGqppoANHtTTTpZ1FMljaF7B8SCf4ViBLXwIDAQAB
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.