Domain & Email Security Check (SPF, DMARC, DKIM, TLS, NIS2)

Domain Security & Email Deliverability — DNS, SPF, DMARC, DKIM

ryanclinton/dns-record-lookup

Audit a domain portfolio for email spoofing, broken SPF, DMARC enforcement, DNSSEC and shadow-SaaS senders. Returns a posture score, what to fix first, vendor dependencies and drift alerts — not just records. Bulk DNS / SPF / DMARC / DKIM lookup, no API keys.

🛡️ Audit MX, SPF, DMARC, DKIM, MTA-STS, TLS-RPT, BIMI, CAA, DNSSEC, and web TLS without sending email. Get evidence-backed security and deliverability scores, prioritized fixes, and a client-ready report.

HTTP Probe -- TLS, Security Headers, Redirects

jungle_synthesizer/ssl-security-headers-checker

Bulk site-health probe: TLS certificate, security-header grading (CSP, HSTS, X-Frame-Options, Permissions-Policy + 5 others, A/B/C/D/F grade), redirect chain, TTFB, HTTP/2 + HTTP/3, IPv6 reachability. Built for devops, security, and CI pipelines.

Passive bulk check of HSTS, CSP, cookie flags, HTTPS redirect, TLS versions and certificate expiry. A-F grade with prioritised fix recommendations.

Security Headers Checker API - HTTP Security Scanner

pink_comic/security-headers-checker

Security Headers Checker API for bulk HTTP security scans. Audit HSTS, CSP, X-Frame-Options, referrer and permissions policies, missing headers, website hardening gaps, and compliance posture. Returns grades, findings, and header evidence for security audits.

Validate email security DNS records for any domain: DMARC, SPF, DKIM. Outputs structured validation results. Pay-per-event.

Domain Health Checker: SPF, DKIM, DMARC, SSL & Security Headers

cobalt_relay/domain-health-checker

Bulk-check any list of domains for email deliverability (SPF, DKIM, DMARC, MTA-STS), SSL certificate expiry, DNSSEC and website security headers. Get a 0-100 score, an A-F grade, the mail and DNS provider, and plain-English fixes for every problem.

Grade any list of domains A-F: SPF, DMARC, DKIM, MX, CAA, TLS certificate expiry, HTTPS redirect, security headers and security.txt. Public data only.

Domain & Email DNS Checker: WHOIS/RDAP, SPF, DMARC, DKIM, MX

veedel_digital/domain-check

Bulk check domains: registrar, creation and expiry date via RDAP (WHOIS), nameservers, DNSSEC, plus email security with SPF, DMARC, DKIM and MX records. Flags spoofable domains and domains about to expire. No proxies, pay per domain.

Email Security Scanner

cerridwen/email-security-scanner

DNS-only email posture for any domain: MX, SPF, DMARC, DKIM probes, MTA-STS, BIMI. No email sent. Returns score + actionable tips. Batch-friendly for CRM domains and compliance snapshots.