DKIM signing
Use cryptographic signatures to prove messages were sent by an authorized service.
Live tool
Check selector
What is it?
DomainKeys Identified Mail (DKIM) uses a public key in DNS and a private key held by your mail provider.
Why is it important?
DKIM helps receiving systems verify message integrity and supports DMARC alignment.
How do you improve it?
Enable DKIM at every sending provider, publish the provider’s selector record, and rotate keys according to your provider’s guidance.
How DomainShield Tower checks it
We inspect publicly available DNS, TLS, website, and reputation signals and explain the result in a report. Scanning is read-only and does not change your infrastructure.
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