Is that DKIM record actually right?
Check a selector, or scan a domain for the ones it publishes. Paste a message’s headers, or send a test email to a throwaway address, to see how it was really signed. No accounts.
Paste a message’s headers
Every DKIM-Signature is parsed, the key it names is looked up in DNS, and the signature is verified.
Analyse headersSend a test email
Get a throwaway address, send it anything, and see how the message was really signed, including selectors nobody could guess.
Get an address