DKIM Record
Checker
Validate DKIM signatures and verify email authentication
Ensure your emails are cryptographically signed and trusted
Check DKIM Record
Verify DKIM configuration and public key setup
Selector Scanning
Auto-detect common DKIM selectors
Key Validation
Verify public key format and strength
Security Analysis
Check key size and algorithm strength
Missing DKIM Records?
InboxKit automatically generates and manages DKIM keys for all your domains.
Get DKIM Setup HelpDKIM Record Checker Guide
Understanding DomainKeys Identified Mail (DKIM) authentication
How DKIM Works
- 1.Email server signs outgoing messages with private key
- 2.Signature added to email headers (DKIM-Signature)
- 3.Receiving server retrieves public key from DNS
- 4.Signature verified using public key
- 5.Email authenticated if signature matches
Common DKIM Issues
- Key size less than 1024 bits (insecure)
- Incorrect selector configuration
- DNS record formatting errors
- Mismatched public/private key pairs
- Multiple TXT strings not concatenated
Common DKIM Selectors by Provider
Email Services
- • Google Workspace:
google - • Microsoft 365:
selector1, selector2 - • Zoho:
zoho
Marketing Platforms
- • Mailchimp:
k1, k2, k3 - • SendGrid:
s1, s2, sendgrid - • Mailgun:
pic, krs, mailgun
Transactional
- • Amazon SES:
amazonses - • Postmark:
YYYYMMDD - • SparkPost:
sparkpost
What is a DKIM Record Checker?
A DKIM record checker is an essential email authentication tool that validates DomainKeys Identified Mail (DKIM) records in your domain's DNS. DKIM uses cryptographic signatures to verify that emails haven't been tampered with during transmission and originate from authorized servers. Our checker automatically scans common DKIM selectors and validates public key configurations.
Why DKIM Verification Matters
DKIM authentication is crucial for email deliverability and security. Major email providers like Gmail, Outlook, and Yahoo require DKIM signatures for bulk senders. Without proper DKIM configuration, your emails may be marked as spam or rejected entirely. Regular DKIM checks ensure your email authentication remains intact and effective.
DKIM Best Practices for 2024
- Use 2048-bit RSA keys for stronger security (1024-bit is deprecated)
- Implement separate DKIM selectors for different email services
- Rotate DKIM keys periodically to maintain security
- Monitor DKIM pass rates through DMARC reports
- Ensure DNS records are properly formatted with no extra spaces
- Test DKIM signatures regularly with authentication checkers
Automate Your Email Authentication
Stop managing DNS records manually. InboxKit handles SPF, DKIM, and DMARC automatically.