DKIM Validator

Validate DKIM (DomainKeys Identified Mail) records to ensure your email authentication is properly configured

🌐 Domain Name*

Enter your domain without protocol (e.g., example.com)

🔑 DKIM Selector*

What is a DKIM Selector?

A DKIM selector is a string that identifies which DKIM key to use for verification. Common selectors include 'default', 'google', 'selector1', etc.

How to find it:

• Check your email provider's documentation

• Look at email headers for 's=' parameter

• Try common selectors from the dropdown

Choose from common selectors or enter a custom one

📚 DKIM Validator Guide & Tips

💡 Quick Start Tips

• New to DKIM? Try "default" selector first - it's the most common
• Don't know your selector? Use the "Auto-detect" button to find it automatically
• Multiple selectors? Some domains use multiple DKIM keys for different services

📧 How to Find Your DKIM Selector

Method 1: Check Email Headers

Send a test email from your domain
View the email's raw headers in your email client
Look for "DKIM-Signature:" line
Find "s=" parameter - that's your selector

Method 2: Common Selectors by Provider

Google Workspace: "google", "default"

Microsoft 365: "selector1", "selector2"

SendGrid: "smtpapi"

Mailgun: "mxvault", "k1"

Amazon SES: Custom (check console)

cPanel/WHM: "default", "mail"

Method 3: DNS Lookup

Check DNS TXT records for: [selector]._domainkey.yourdomain.com

⚠️ Common Issues & Solutions

• Record not found: Check if DKIM is enabled in your email provider
• Wrong selector: Try common selectors or check email headers
• DNS propagation: Wait 24-48 hours after setting up DKIM
• Key length warning: Use at least 1024-bit keys (2048-bit recommended)

🎯 What This Tool Checks

✅ Validation Checks:

DNS record existence
Public key format
Algorithm compatibility
Key length security

📊 Detailed Analysis:

Key type and length
Signature algorithm
Record syntax validation
Security recommendations

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About DKIM Validation

What is DKIM?

DKIM (DomainKeys Identified Mail) is an email authentication method that allows the receiver to check that an email claimed to have come from a specific domain was indeed authorized by the owner of that domain.

How DKIM Works

• Email server signs outgoing messages with a private key
• Public key is published in DNS as a TXT record
• Receiving server verifies signature using public key
• Ensures message integrity and sender authenticity

Benefits of DKIM

• Prevents email spoofing and phishing
• Improves email deliverability rates
• Builds sender reputation and trust
• Required for DMARC compliance
• Protects brand reputation

Common DKIM Issues

• Missing or incorrect DNS records
• Weak key lengths (less than 1024 bits)
• Expired or rotated keys
• Incorrect selector configuration

Troubleshooting Guides

TXT record not found

Fix DKIM selector TXT and verification issues.

DNS not propagating

Checklist to resolve caching and nameserver mistakes.

Check propagation globally

Compare by country/provider and use expected matching.

DNS lookup

Validate DKIM TXT values and record configuration.

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