What is DKIM and why is it important for email?

DKIM (DomainKeys Identified Mail) is an email authentication protocol that uses digital signatures to verify that emails genuinely come from your domain. It's important because it prevents email spoofing, improves deliverability rates, and helps protect your domain reputation. Without DKIM, your emails are more likely to be flagged as spam or rejected by receiving mail servers.

How do I find my DKIM selector?

Your DKIM selector depends on your email service provider. Common selectors include 'default', 'google' (for Google Workspace), 'amazonses' (for Amazon SES), or custom selectors you've created. Check your email provider's documentation or your mail server configuration to find the correct selector. You can also try common selectors in DKIM Checker to identify which one is active.

What does it mean if my DKIM check fails?

A failed DKIM check typically indicates that the DKIM record is not properly published in your DNS, the selector is incorrect, or the record is misconfigured. Verify that your DNS provider has the correct TXT record with the proper public key, ensure the selector matches your mail server configuration, and allow time for DNS propagation (up to 48 hours) after making changes.

Can I have multiple DKIM records for one domain?

Yes, you can have multiple DKIM records for the same domain by using different selectors. This allows you to rotate keys for security purposes, use different keys for different mail servers, or transition to new keys without disrupting email delivery. Each selector points to a separate TXT record containing its own public key.

How often should I check my DKIM records?

You should check your DKIM records whenever you make changes to your email configuration, switch email providers, or notice delivery issues. Additionally, perform regular security audits (monthly or quarterly) to ensure DKIM remains properly configured. This helps maintain consistent email deliverability and prevents authentication failures.

DKIM Checker

How to Use DKIM Checker

When to Use DKIM Checker

Technical Information About DKIM

Frequently Asked Questions