SPF, DKIM & DMARC Email Security Record Validator
Inspect domain email authentication records, prevent spoofing and phishing risks, and test DMARC enforcement policies for Gmail and Yahoo compliance.
Launch SPF / DKIM / DMARC Checker Workspace
Access the interactive live engine for SPF / DKIM / DMARC Checker with real-time feedback, batch processing, and privacy-first local computation.
How to Use SPF / DKIM / DMARC Checker
- Enter your email-sending domain name.
- The system queries DNS for TXT records starting with v=spf1 and v=DMARC1.
- Evaluate your DMARC policy enforcement (p=none, p=quarantine, or p=reject).
- Review alignment and syntax warnings to ensure high email deliverability.
Key Features & Security Standards
Client-Side & In-Memory Privacy
All computations, transformations, and string manipulations execute in your local browser memory or isolated ephemeral worker instances with zero permanent disk persistence.
Zero File or Data Retention
Your sensitive files, JWT keys, credentials, and code snippets are never shared, logged, or indexed. Data is automatically flushed as soon as your browser tab closes.
100% Free & Unlimited Usage
No credit cards, sign-ups, subscriptions, or watermarks. All SPF / DKIM / DMARC Checker features are accessible without rate limitations or intrusive paywalls.
Frequently Asked Questions
Why are SPF, DKIM, and DMARC essential in 2026?+
Major email providers like Google and Yahoo require senders to enforce email authentication to eliminate spam, spoofing, and phishing.
What does a DMARC policy of 'p=reject' mean?+
It instructs receiving mail servers to automatically reject and block any incoming email that fails SPF and DKIM authentication checks.
How does SPF work?+
SPF (Sender Policy Framework) lists the authorized IP addresses and mail servers permitted to send email on behalf of your domain.