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DKIM Record Checker

Verify your domain's DKIM configuration for email authentication. Check the public key, selector, and key strength to ensure your emails are properly signed.

Check DKIM Record

Verify your domain's DKIM configuration for email authentication

Leave empty to auto-detect common selectors

What is DKIM?

DKIM (DomainKeys Identified Mail) adds a digital signature to your emails, allowing receiving servers to verify that the email was actually sent by your domain and wasn't modified in transit.

Common DKIM selectors:

  • google - Google Workspace
  • selector1, selector2 - Microsoft 365
  • k1 - Mailchimp
  • s1, s2 - Amazon SES
  • default - Many providers

About this tool

DKIM is the second pillar of email authentication, complementing SPF records by cryptographically signing your messages. This proves they came from you and haven't been modified in transit. Once DKIM is configured, combine it with DMARC policy to complete your authentication setup. Monitor your DNS records with our DNS propagation checker when making changes, and use email header analysis to debug authentication failures.

Frequently Asked Questions

DKIM (DomainKeys Identified Mail) adds a digital signature to your emails using public-key cryptography. Receiving servers can verify this signature to confirm the email came from your domain and wasn't modified.

A selector is a name that identifies a specific DKIM key for your domain. You might have multiple selectors for different email services (e.g., 'google' for Google Workspace, 'k1' for Mailchimp).

DKIM keys should be at least 1024 bits, with 2048 bits recommended. Shorter keys are vulnerable to brute-force attacks and may cause authentication failures with strict receivers.

Check your email service provider's documentation. Common selectors include 'google' (Google Workspace), 'selector1'/'selector2' (Microsoft 365), 'k1' (Mailchimp), and 'default' (many providers).

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