Email DNS Health Checker (MX/SPF/DMARC)
Check MX SPF and DMARC DNS records with practical email-health grading.
A combined health check of the DNS records that control email delivery and anti-spoofing: MX (mail routing), SPF (authorized senders), and DMARC (spoofing policy). Queried live over Cloudflare DNS-over-HTTPS.
About this tool
Email DNS Health Checker (MX/SPF/DMARC) is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
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