Verify your domain's DKIM authentication setup. Check cryptographic email signatures and key strength to prevent spoofing and improve deliverability.
Enter a domain name to check its DKIM authentication configuration
Check your domain's DKIM records to ensure emails are properly signed and authenticated
Cryptographic email verification
Ensure your outgoing emails are digitally signed with DKIM authentication
Key strength analysis
Validate your DKIM key length and cryptographic strength
Multi-selector detection
Check common DKIM selectors used by major email providers
Security recommendations
Get actionable advice to strengthen your DKIM configuration
DKIM (DomainKeys Identified Mail) is a cryptographic authentication method that allows email receivers to verify that emails were actually sent by the domain they claim to be from and haven't been tampered with in transit.
DKIM uses public-key cryptography. Your mail server signs emails with a private key, and recipients can verify the signature using the public key published in your DNS records. This ensures email authenticity and integrity.
Protect your domain from email spoofing and phishing attacks by cryptographically proving email authenticity
Major email providers like Gmail and Outlook use DKIM verification to determine email legitimacy and inbox placement
Prevent bad actors from sending emails that appear to come from your domain, protecting your brand reputation
Many industries and email providers now require proper email authentication for bulk email sending
Comprehensive analysis of your domain's DKIM authentication in three simple steps
Simply enter any domain name you want to check for DKIM authentication
Our tool checks common DKIM selectors used by major email providers and custom setups
Get detailed analysis of key strength, security, and actionable recommendations
Our tool identifies and helps you fix these critical email authentication problems
Domains without DKIM authentication are more likely to be flagged as spam and vulnerable to spoofing attacks.
Identifies RSA keys shorter than 2048 bits or other weak cryptographic configurations that compromise security.
Detects use of outdated SHA-1 hashing that's vulnerable to collision attacks and should be replaced with SHA-256.
Flags DKIM records still in testing mode (t=y) that should be moved to production for full authentication.
Identifies domains with only one DKIM selector, recommending multiple selectors for redundancy and easier key rotation.
Detects when DKIM records haven't fully propagated through DNS, causing intermittent authentication failures.
Learn more about DKIM authentication and how our checker helps secure your email infrastructure
Still have questions about DKIM authentication?
Contact SupportUse our DKIM Record Checker to verify your email authentication setup, strengthen security, and improve deliverability.