Raw Record
Issues Found
Free DKIM Record Checker
Verify your DKIM signatures and check key strength
DKIM passing is a starting point, not the destination. See how DKIM alignment ties into the full DMARC progression — including the key-rotation pitfall that breaks alignment overnight. Read the DMARC policy guide →
What is DKIM?
DKIM adds a cryptographic signature to your emails using a private key. Receiving servers verify this signature using your public key published in DNS.
This proves the email came from your domain and wasn't altered in transit, helping improve deliverability and protect against spoofing.
Common DKIM Selectors
Google Workspace
selector1
Microsoft 365
s1
SendGrid
k1
Mailchimp
Related Tools
DKIM works alongside SPF and DMARC. Check all three for complete email authentication.
Learn More About DKIM
Common DKIM Mistakes
Avoid these configuration pitfalls
DKIM Key Rotation: How Often?
Best practices for rotating your keys
How to Ask Your ESP to Fix DKIM
Templates for vendor communication
DMARC Alignment Explained Simply
How DKIM alignment affects DMARC
Getting Your ESP to Fix DKIM
Step-by-step vendor coordination guide
Third-Party Senders and DMARC
Configure DKIM for all your senders
