DNS & Email Security Checker
Scan any domain's email authentication records (SPF, DKIM, DMARC) and get an instant security grade.
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DNS & Email Security Analysis
Check any domain's email authentication setup including SPF, DKIM, and DMARC records. Poor email security leads to phishing vulnerability, deliverability issues, and can damage your sender reputation.
Email Security Grading System
| Grade | Requirements | Risk Level |
|---|---|---|
| A+ | SPF + DMARC (reject/quarantine) + DKIM + HSTS | Minimal |
| A | SPF + DMARC (reject/quarantine) + DKIM | Low |
| B | SPF + DMARC (reporting only) | Moderate |
| C | SPF only | High |
| F | No email authentication | Critical |
What We Check
- SPF Record: Authorized mail servers for the domain
- DMARC Policy: How unauthenticated emails are handled
- DKIM: Digital signature verification presence
- HSTS: HTTP Strict Transport Security header
Frequently Asked Questions
What is SPF?▾
Sender Policy Framework (SPF) is a DNS record that specifies which mail servers are authorized to send emails on behalf of your domain. It helps prevent email spoofing.
What is DMARC?▾
DMARC (Domain-based Message Authentication, Reporting & Conformance) builds on SPF and DKIM to tell receiving servers what to do with unauthenticated emails: report, quarantine, or reject them.
What is DKIM?▾
DomainKeys Identified Mail (DKIM) adds a digital signature to outgoing emails, allowing receivers to verify that the email hasn't been tampered with in transit.
Why should I check email security?▾
Misconfigured email authentication leads to phishing attacks, deliverability problems, and brand reputation damage. Regularly checking SPF, DKIM, and DMARC records is essential.
How is the security grade calculated?▾
Grade A requires SPF + DMARC with reject/quarantine policy + DKIM. Grade B has SPF + DMARC with reporting only. Grade C has SPF only. Grade D has partial/misconfigured records. Grade F has no email authentication.
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