DKIM Checker

Look up a DKIM selector record and inspect the public key published for a domain.

DKIM key

Checks a selector._domainkey TXT record for a DKIM public key.

How DKIM selectors work

DKIM records are TXT records under selector._domainkey.example.com. The selector is chosen by the sending service.

Check DKIM when setting up a mail provider, debugging authentication failures, or rotating signing keys.

Recommended next steps

Use the full health check when one DNS record is not enough to explain inbox placement.

Read the guides for SPF, DMARC, DKIM, and blacklist cleanup.

Understand DKIM selectors and how they point receivers to the right public signing key.

Common technical reasons legitimate email lands in spam and how to investigate them.

Your mail provider usually shows it in setup instructions. It may look like default, google, s1, selector1, or a date-based value.

The selector may be wrong, the DNS record may not have propagated, or DKIM may not be enabled for that sender.