DKIM Validator

A DKIM validation tool for developers and email admins to verify DKIM records and selector alignment for domain-based email authentication.

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1,440+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

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About This Tool

The tool validates DKIM by performing DNS TXT lookups for the domain's selector keys and parsing the DKIM-Signature header structure conceptually. It verifies that v=DKIM1 is present, p= contains a base64 key, and that the key length meets recommended security thresholds. It also assesses alignment between the domain in From and the d= domain in the DKIM signature. This supports multiple selectors and domains and provides actionable remediation suggestions.

Who benefits: email administrators, security engineers, DevOps, and developers responsible for deliverability and phishing resistance. It helps pinpoint misconfigurations, such as missing selectors or incorrect DNS records, and facilitates faster recovery after changes.

Core value: automated, standards-based validation with detailed outputs including pass/fail status, key length, canonicalization methods, used selector, and DNSSEC status; it reduces manual DNS analysis and speeds remediation.

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How to Use

Provide inputs: Domain and selector values (e.g., example.org, default).
Optionally specify additional selectors or enable advanced DNS checks.
Run validation: tool performs DNS lookups and parses DKIM records.
Review outputs: overall result, key length, alignment status, and suggested fixes.
Apply remediation: update DNS TXT records accordingly and re-run validation.

Frequently Asked Questions

Find Quick Answers

What inputs are required?

You must provide the domain (fully qualified domain name) and the DKIM selector (e.g., default). Optional inputs include testing multiple selectors in separate checks. The tool aggregates results for clarity and actionable remediation guidance.

What does a pass indicate?

A pass means a valid DKIM public key exists for the selector, the record is well-formed (v=DKIM1 present, p= key present), and alignment with the From header domain is satisfied under RFC6376 rules. It does not guarantee delivery but indicates proper configuration.

Why would it fail?

Failures occur if the DNS TXT record is missing, malformed, or not aligned with the From domain; if v=DKIM1 is absent; if the key length is too short; or if DNS resolution encounters NXDOMAIN or DNSSEC issues. It highlights exact misconfigurations.

Can it test multiple selectors or domains?

Yes. You can test multiple (domain, selector) pairs in separate checks and aggregate results. The tool reports per-selector findings and provides consolidated remediation guidance for efficient DNS corrections.

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