What is a DKIM selector and how do I find it?

A DKIM selector identifies which key to use for signing. Find it in email headers under DKIM-Signature as s=selector. Common selectors include default, google, s1, s2, selector1, or mail.

What does an empty p= tag mean in DKIM?

An empty p= tag (p=) indicates the DKIM key has been revoked. Emails signed with this key will fail DKIM verification, so update your email configuration immediately.

What DKIM key types are supported?

DKIM supports RSA keys (1024-2048 bit, most common) and Ed25519 keys (newer, more secure, shorter). The key type is specified in the k= tag, with RSA being the default.

Do I need both SPF and DKIM for email authentication?

Yes, they complement each other. SPF verifies sending server authorization while DKIM verifies message integrity and authenticity. DMARC policies require at least one to pass for alignment.

Why is my DKIM record not found?

Common causes include incorrect selector, DNS propagation delays, missing _domainkey subdomain, or the record being published as CNAME instead of TXT. Verify the exact selector name and DNS configuration.

DKIM Record Checker - Free DKIM DNS Record Validator

The DKIM Record Checker is a specialized email authentication tool that validates and analyzes DKIM (DomainKeys Identified Mail) DNS records for any domain and selector combination. This powerful utility helps email administrators verify their DKIM configuration, ensuring cryptographic email signatures are properly set up to authenticate messages and improve deliverability rates.

How to Validate DKIM Records

Enter your domain name and DKIM selector to perform an instant DNS lookup of the DKIM TXT record. The tool retrieves the record from selector._domainkey.yourdomain.com, parsing all DKIM tags including the public key (p=), key type (k=), service type (s=), and flags (t=). It validates the cryptographic key format, checks for proper tag syntax, and identifies potential configuration issues that could cause DKIM verification failures.

Advanced DKIM Analysis Features

Real-time DKIM record lookup with comprehensive tag parsing
Public key validation for RSA and Ed25519 key types
Selector discovery assistance and common selector testing
Tag-by-tag explanation of DKIM policy settings
Integration status verification for email authentication

DKIM Implementation Best Practices

Use unique DKIM selectors for different mail streams and rotate keys regularly for security. Implement 2048-bit RSA keys or Ed25519 keys for stronger cryptographic protection. Monitor your DKIM records after DNS changes, as propagation delays can temporarily break email signing. Coordinate DKIM with SPF and DMARC policies for comprehensive email authentication.

This free DKIM validator ensures your domain's email signatures are correctly configured, helping maintain sender reputation and preventing legitimate emails from being marked as spam or rejected by receiving mail servers.

DKIM Record Checker - Free DKIM DNS Record Validator