Definition
Signing proves the email was not tampered with in transit. The DNS-published key lets receivers verify the signature.
Best Practices
- Sign with DKIM on all mail, marketing and transactional.
- Rotate keys and keep old selectors during transition.
- Keep private keys secure on your mail server.
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Frequently Asked Questions
To sign and verify that an email came from your domain.
Public key in DNS; private key held by the signer.
Regular rotation reduces risk if a key is compromised.