DNS Email Authentication Diagnostics

by prawiefiolekGitHubUpdated Oct 6, 2026

Diagnose a domain's email authentication and DNS health with live lookups: SPF records (with include-chain DNS-lookup counting against RFC 7208's 10-lookup limit), DMARC policy enforcement, MX records (incl. null-MX detection), plus RDAP registration expiry, DNSSEC DS-record presence, and nameserver redundancy. Uses Cloudflare/Google DNS-over-HTTPS and rdap.org. No API key needed.

dns, email, spf, dmarc, deliverability, devops, security, canada
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Diagnose a domain's email authentication and DNS health with live lookups: SPF records (with include-chain DNS-lookup counting against RFC 7208's 10-lookup limit), DMARC policy enforcement, MX records (incl. null-MX detection), plus RDAP registration expiry, DNSSEC DS-record presence, and nameserver redundancy. Uses Cloudflare/Google DNS-over-HTTPS and rdap.org. No API key needed.