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DKIM (DomainKeys Identified Mail) is a way for email providers to check that an email actually came from the domain it says it did. Think of it like a digital signature for emails. If the signature matches, your email is more likely to be trusted and not marked as spam.
A DKIM record is stored in your domain's public DNS and is used to verify the sender's identity. Proper DKIM setup helps prevent spoofing and phishing.
In simple terms:
⚠️ Note: Customized DKIM records might not appear in this scan if they are not in the database. This is normal, but keep it in mind when reviewing results.