Email Authentication Checker

Enter a domain and get a plain-English verdict on its email authentication — MX, SPF and DMARC — with a score and the exact next step to fix each gap. Free, instant, nothing stored.

Checking whether a specific mailbox exists? This scores a domain's setup. To verify a real email address in real time, use MailTester Ninja →

Need to publish or tighten records? Use the SPF & DMARC generator. Learn more on the email checker and email verifier pillars.

Built & updated automatically by MailTester Ninja — the email verifier that stores nothing. DNS-only, aggregate data, no personal information. · Index · Email checker · Tools · Guides · Insights · JSON API · ✓ Verify an email address →