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.

Data · Email checker · Email verifier · Blocklist checker · Blocklists explained · Widget

Built & updated automatically by MailTester Ninja, the email verifier that stores nothing. DNS-only, aggregate data, no personal information. · JSON API · RSS