DKIM (DomainKeys Identified Mail)
An email authentication method that adds a cryptographic signature to verify messages haven't been altered in transit.
Why It Matters
DKIM proves your emails are genuinely from you and haven't been tampered with, boosting inbox placement.
How It Works
Your sending server signs each outgoing email with a private key. The receiving server retrieves your public key from DNS and uses it to verify the signature matches the message content.
Real-World Example
A Klaviyo user sets up DKIM by adding two CNAME records to their DNS, enabling cryptographic signing on all campaigns.
Common Mistakes
Not setting up DKIM when onboarding a new ESP
Using a weak key length below 1024 bits
Related Terms
A DNS record that specifies which mail servers are authorized to send email on behalf of your domain.
An email policy that tells receiving servers what to do when SPF or DKIM authentication fails.
The ability of your emails to successfully reach recipients' inboxes rather than spam folders or being blocked.
DKIM (DomainKeys Identified Mail) FAQs
How do I set up DKIM?
Your ESP provides DKIM keys that you add as CNAME or TXT records in your domain's DNS settings.
Does DKIM prevent spoofing?
DKIM alone doesn't prevent spoofing but combined with DMARC it tells receivers to reject unsigned messages from your domain.
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