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Executive's DNS Intelligence Brief

Board-level domain security assessment — mail.joelmueller.ch

1 May 2026, 18:07 UTC · 60.6s · SHA-3-512: 13ac✱✱✱✱ Verify ·Archived
DNS Security & Trust Posture
Risk Level: High Risk
4 protocols configured, 5 not configured
1 recommendation
Analysis Confidence
MODERATE
Resolver agreement is inconsistent for some protocols, limiting confidence. Data currency and system maturity are adequate.
Email Spoofing
Partial
Brand Impersonation
Not Set Up
DNS Tampering
Protected
Certificate Control
Configured
What Requires Attention
Recommended Publish a DMARC record starting with p=none and rua reporting
The BIG Questions
Can this domain be impersonated by email? Likely SPF alone cannot prevent spoofing
Can DNS itself be tampered with? No DNSSEC signed and validated, cryptographic chain of trust verified
Can this brand be convincingly faked? Yes No DMARC policy (RFC 7489) — attackers can send email appearing to be from this domain with no sender-authentication barrier
Is mail transport encryption enforced? No No MTA-STS or DANE — mail transport encryption is opportunistic only
Is certificate issuance controlled? Yes CAA records restrict which certificate authorities may issue certificates
Does this domain publish AI agent instructions? No No llms.txt file detected — AI models have no structured instructions for this domain
Is AI crawling of our content controlled? No No robots.txt found — AI crawlers have unrestricted access
Has someone manipulated AI recommendations about us? No No indicators of AI recommendation manipulation found
Are there hidden AI prompts on our site? No No hidden prompt artifacts found in page source
Domain Overview
Registrar Cloudflare Registrar
Email Provider Proton Mail
Web Hosting Unknown
DNS Hosting Cloudflare

Technical Findings

Email Authentication
Can this domain be impersonated by email? Likely — SPF alone cannot prevent spoofing
SPF (Sender Policy) Configured
DMARC (Policy) Missing
DKIM (Signatures) Not Detected
Mail Posture Limited Protection
Mail Transport Security
Is mail transport encryption enforced? No — No MTA-STS or DANE — mail transport encryption is opportunistic only
MTA-STS Partial
DANE / TLSA Hosted Provider No DANE/TLSA records found (checked 3 MX hosts)
TLS-RPT (Reporting) Not Configured
Mail Transport Opportunistic Policy-assessed 2 probes
DNS Security
Can DNS itself be tampered with? No — DNSSEC signed and validated, cryptographic chain of trust verified
DNSSEC Signed & Validated
DNSSEC fully configured and validated — AD (Authenticated Data) flag set by resolver 8.8.8.8 confirming cryptographic chain of trust from root to zone (RFC 4035 §3.2.3)
NS Delegation Healthy Managed DNS
Delegation Consistency 2 Issues
NS Fleet Health 2 Issues Diversity: Good
Brand & Certificate Controls
Can this brand be convincingly faked? Yes — No DMARC policy (RFC 7489) — attackers can send email appearing to be from this domain with no sender-authentication barrier
Is certificate issuance controlled? Yes — CAA records restrict which certificate authorities may issue certificates
BIMI (Brand Logo) Not Configured
CAA (Certificate) Configured
AI Surface Scanner Scanned
Does this domain publish AI agent instructions? No — No llms.txt file detected — AI models have no structured instructions for this domain
Is AI crawling of our content controlled? No — No robots.txt found — AI crawlers have unrestricted access
Has someone manipulated AI recommendations about us? No — No indicators of AI recommendation manipulation found
Are there hidden AI prompts on our site? No — No hidden prompt artifacts found in page source
LLM Context File Not Found No llms.txt file detected
AI Crawler Governance No robots.txt
Poisoning Indicators None Found No AI recommendation poisoning indicators detected
Hidden Prompt Artifacts None Found No hidden prompt artifacts detected
Public Exposure Clear No secrets detected in publicly accessible source
Priority Actions 3 total Achievable: Low Risk
Critical Publish DMARC Record

Add a DMARC record to protect your domain against email spoofing and receive authentication reports.

Low Add TLS-RPT Reporting

TLS-RPT (TLS Reporting) sends you reports about TLS connection failures when other servers try to deliver mail to your domain.

Low Deploy MTA-STS

MTA-STS enforces TLS encryption for inbound mail delivery, preventing downgrade attacks on your mail transport.

Appendix — Additional Resources

Full technical details including raw DNS records, DKIM public keys, IP/ASN mappings, resolver consensus evidence, and verification commands are available in the Engineer's DNS Intelligence Report.

View Engineer's DNS Intelligence Report

Verify Report Integrity SHA-3-512 Has this report been tampered with? Verify below

Tamper-evident fingerprint binding this analysis to its data, domain, timestamp, and tool version.

13ac73319888bcd579ca8796d6526a38c3a8120be1549ae7237df5f8c9e5c8a405346e63dce3d26d6f4a0b19daa7076fe79c4324e1056c82aada2e6b6497cd75
12 RFCs evaluated · DNS state at 1 May 2026, 18:07 UTC
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