One record at a time — mx · spf · dkim · dmarc

Quick individual DNS checks, resolved over DNS-over-HTTPS straight from your browser. No sign-in, nothing stored. Want the four graded together instead? That's ./email-security-grade.

Every record here feeds a bigger picture — ./email-security-grade scores all four together, and the ./email-header-analyzer shows how they held up on a real message.

Queries resolve via Cloudflare (1.1.1.1) DNS-over-HTTPS with Google DNS as fallback, from your browser — this site never sees the domains you look up. Interpretations are heuristics, not a mail-flow audit.