Definition
A DKIM key is the cryptographic pair used to sign and verify email. The public key is published in DNS, and receivers use it to confirm the message was not tampered with.
Key management includes rotation and keeping the private key secure.
DKIM keys sign your mail and prove its integrity, with the public key published in DNS for verification. Key rotation and secure storage keep the system trustworthy. Authentication failures usually trace back to mismatched or expired keys.
How DKIM Keys Work
The private key signs the message; the public key in DNS verifies it.
Rotation keeps keys secure over time.
Why It Matters
DKIM keys sign your mail and prove its integrity. Understanding key management prevents the authentication failures that hurt delivery.
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.
- Verify your public key in DNS.
- Monitor DKIM pass rates.
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Frequently Asked Questions
To sign and verify that an email came from your domain. DKIM keys sign your mail and prove its integrity, with the public key published in DNS for verification.
Public key in DNS; private key held by the signer. Key rotation and secure storage keep the system trustworthy.
Regular rotation reduces risk if a key is compromised. Authentication failures usually trace back to mismatched or expired keys.
Mail may fail DMARC and be filtered. DKIM keys sign your mail and prove its integrity, with the public key published in DNS for verification.
Use a DNS lookup or an authentication checker. Key rotation and secure storage keep the system trustworthy.