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Inbox Theory

Authentication

DKIM Record Checker

Looks up a DKIM key record for a given selector and checks it against RFC 6376 — key presence, revocation, and obvious weaknesses.

The selector is chosen by whoever set up DKIM for this domain — look for it in the DKIM signing setup of your mail provider, or in a DKIM-Signature: s=... header on a message you’ve received from this domain.