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 olx.pl
Found
Selector: default
(TXT on default._domainkey.olx.pl)
v=DKIM1; g=*; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDAqB0ia/Ng5rk8NlFId9tMrRikb9gon49XKb3KQlqfVZ8fg0xqtp8270TS23IhSt9WjnPZ26kteFbDpw/Ad30iRKGLLnhihuCCbbHKlk3KCe05JhrHEhVMCY/SGb4qkhVNaPkFn41tjPwFB5jLFrxJB6ny5fFT6YUMHU5ZY/TtgQIDAQAB
Selector: google
(TXT on google._domainkey.olx.pl)
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCilN3FxnB5B2oQonHcXOhg2/w5KiwnEJ7lgRDF0yrKuFAFxBmZq/NHC3DHTnt7oRoRQncH9NRSj25D+PUYoUCQVL8fvstmsuOtCMRULYtW7lN6IsOLHRI1sZAjw7ghdFdIqsC5BPCHiI90+q/HTMeOt9h8BvFAhsDk1GXFPM20iQIDAQAB
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.