feat: broaden email-auth checker + paste-ready fixes#85
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Adds MTA-STS/TLS-RPT/BIMI, parses DMARC pct/sp so a reject-at-pct=0 record stops scoring Strong, and emits paste-ready DNS records per gap — the lead-qualifying pass in one run.
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What
Broadens
/tools/dmarc-checkfrom "DMARC/SPF/DKIM" into a fuller email-auth pass, so one run qualifies a domain end-to-end. Same URL — today's JSON-LD/OG work keeps its equity.New checks — all pure DNS, no new attack surface
MTA-STS (
_mta-sts), TLS-RPT (_smtp._tls), BIMI (default._bimi). Reported as optional hardening and deliberately not scored — a domain without BIMI isn't insecure, it's just not decorated.DMARC, done properly
pct/sp, and detects multiple DMARC records (which receivers must ignore — publishing two is worse than one).p=reject; pct=0orp=reject; sp=noneno longer reads "Strong" while enforcing nothing.Paste-ready fixes
Every gap emits the exact DNS record for that domain, tailored to the detected provider (Google →
include:_spf.google.com, M365 →include:spf.protection.outlook.com), each with a copy button.Verified
dmarc-dns— incl. thepct=0,sp=none, multi-record cases, and prototype-pollution safety on tag parsing, since TXT keys are attacker-supplied)tsc --noEmit+npm run buildcleanp=quarantineenforcing=true, DKIM found via thedreamhostselector, and it correctly flagged MTA-STS/TLS-RPT as missing and generated both records.Also: added MailChannels to MX detection (verified — it's akritos.com's actual MX), and dropped the unreachable DKIM
warnbranch that tsc surfaced once the type was made honest.Not in this pass — deliberately
DNSSEC (needs DNS-over-HTTPS), the MTA-STS policy file, TLS cert expiry, and security headers all require our server to make outbound requests to a user-supplied host — a real SSRF surface that deserves its own pass with proper guards, not a bolt-on.
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