DKIM Record Checker
Look up and validate DKIM records with key strength analysis and issue detection
What does this tool check?
Selector Discovery
Scans 20+ common DKIM selectors used by popular email providers like Google, Microsoft, Mailchimp, and more.
Key Strength Analysis
Validates RSA key length (1024, 2048, 4096 bit) and flags weak keys that should be upgraded.
Record Validation
Checks for revoked keys, testing mode flags, missing version tags, and other common DKIM issues.
CNAME Resolution
Follows CNAME delegations (used by services like Mailgun and SendGrid) and validates the target record.
What is DKIM?
DomainKeys Identified Mail (DKIM) adds a digital signature to your emails, proving they haven't been tampered with in transit.
- Cryptographic email authentication
- Prevents message tampering
- Required for DMARC alignment
- Improves email deliverability
Common Selectors
Popular email services use these DKIM selectors:
google (Google)
selector1 (Microsoft)
k1 (Mailchimp)
s1 (Generic)
mandrill (Mailchimp)
pm (Postmark)
cm (Campaign Monitor)
smtpapi (SendGrid)