DKIM Signature Checker
Send a test email to our analyzer and get a detailed report on your DKIM configuration. We'll verify your signature, check for common issues, and provide actionable recommendations.
Get Your Test Email Address
Click the button below to generate a unique test email address. You'll send an email to this address from your domain to test your DKIM signature.
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How the DKIM Checker Works
Generate Address
Click the button to generate a unique test email address.
Send Email
Send any email from your address to the test address.
We Analyze
Our server verifies the DKIM signature in your email headers.
Get Report
Receive a detailed report with your DKIM analysis and score.
What is DKIM?
DKIM (DomainKeys Identified Mail) is an email authentication method that allows the receiver to verify that an email was sent and authorized by the owner of that domain.
When you send an email, your mail server creates a unique digital signature using a private key. This signature is added to the email headers. The receiving server then uses a public key (published in your DNS) to verify that the signature is valid.
DKIM ensures that emails haven't been tampered with during transit and confirms that the email genuinely originated from your domain.
DKIM Signature Components
d=Domain
The domain claiming responsibility for the email
s=Selector
Points to the DNS record containing the public key
b=Signature
The actual cryptographic signature hash
a=Algorithm
Usually rsa-sha256 or ed25519-sha256
Why Use Email-Based DKIM Testing?
Unlike DNS-only checkers, our tool verifies actual DKIM signatures from your real emails.
Real Signature Verification
We verify the actual DKIM signature your mail server creates, not just check if DNS records exist.
Complete Header Analysis
We analyze all authentication headers including SPF, DKIM, DMARC, and Authentication-Results.
Actionable Insights
Get specific recommendations based on your actual email configuration, not generic advice.
Related Email Security Tools
Use our complete suite of free tools to analyze your email authentication.
DMARC Checker
Check your DMARC policy, SPF record, and DKIM selectors via DNS lookup.
Check DMARCSPF Checker
Analyze your SPF record, count DNS lookups, and validate authorized senders.
Check SPFMX Lookup
Check MX records and mail server configuration for any domain.
Coming SoonNeed Help With Email Authentication?
Our email security experts can configure DKIM, SPF, and DMARC correctly for your organization.