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DKIM Checker

What is DKIM?
DKIM (DomainKeys Identified Mail) adds a digital signature to your emails to verify they haven't been tampered with. DKIM requires a specific selector (e.g., "default", "google", "k1").

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What is online DKIM Checker?

The DKIM Record Checker is a free online tool that validates DomainKeys Identified Mail (DKIM) records for any domain. It automatically detects common DKIM selectors or allows you to specify a custom selector to verify your email authentication setup. The tool queries DNS records in real-time and displays detailed information about your DKIM configuration, including public keys, TTL values, and key types. This helps ensure your emails are properly authenticated and protected against tampering and spoofing.

How to use DKIM Checker?

Use Cases for DKIM Checker

Frequently Asked Questions

Have questions about DKIM Checker? Find answers to the most common queries below.

DKIM (DomainKeys Identified Mail) is an email authentication method that adds a digital signature to your outgoing emails. It proves that emails from your domain haven't been tampered with during transit and helps prevent email spoofing. Proper DKIM configuration improves email deliverability and reduces the chance of your emails being marked as spam.
A DKIM selector is a unique identifier used to locate your DKIM public key in DNS records. Common selectors include "default," "google," "k1," "selector1," and "selector2." If you don't know your selector, leave the field blank and our tool will automatically scan for common selectors. You can also find your selector in your email provider's admin panel or DKIM setup documentation.
This means no DKIM records were detected using common selectors for your domain. Possible reasons include: DKIM isn't configured yet, you're using a custom selector not in our scan list, DNS records haven't propagated yet (can take up to 48 hours), or there's a typo in your domain name. Try entering your specific selector manually or contact your email provider for the correct selector name.
Yes! Many domains use multiple DKIM selectors for different email services. For example, you might have "google" for Google Workspace and "k1" for Mailchimp. Our auto-detection feature finds all configured selectors, or you can check specific selectors individually to verify each email service is properly authenticated.
Check your DKIM records whenever you: set up a new email service, migrate to a new email provider, experience email deliverability issues, change DNS providers, or rotate DKIM keys for security. It's also good practice to verify DKIM quarterly as part of regular email security audits to ensure records haven't been accidentally deleted or modified.
If the public key field (p=) is empty or missing, your DKIM record is incomplete and email authentication will fail. This typically happens during initial setup before the key is generated, or if the record was copied incorrectly. Generate a new DKIM key pair through your email provider and update your DNS records with the complete public key to fix this issue.
No, this tool performs real-time DNS lookups directly from Cloudflare's DNS service. We don't store, log, or save any domain names or DKIM records you check. All queries are processed instantly and the results are displayed only in your browser session.
DKIM, SPF, and DMARC are complementary email authentication protocols. DKIM verifies email content hasn't been altered using digital signatures. SPF specifies which mail servers can send email for your domain. DMARC builds on both by telling receiving servers what to do with emails that fail authentication. For best email security and deliverability, you should configure all three protocols.