Overview
Findings
Actions
Details
Related
AI-Generated Summary
What this means
note.com scored 92/100, demonstrating a strong security posture. Minor improvements are noted below.
Positive signals: MX Records & Mail Provider, TLS Protocol Support, TLS Configuration all passed.
2 action items identified, including 0 critical. The issues are configuration gaps, not architectural problems. A focused remediation effort of 2–5 days could address all findings.
How note.com compares
Grade distribution across 2598 companies we've scanned. note.com scores better than 92% of them.
83
A+
25
A
190
A-
196
B+
75
B
362
B-
129
C+
114
C
330
C-
119
D+
95
D
252
D-
628
F
note.com — Grade A- (92/100)
2598 companies scanned
Security checks
Each check inspects a different part of note.com's public security setup. Green means healthy, yellow needs attention, red is a problem.
MTA-STS & TLS Reporting
Issues: No MTA-STS configured — email in transit is vulnerable to TLS downgrade attacks. Sending servers cannot verify that your mail server requires TLS; No TLSRPT record — TLS delivery failures won't be reported to domain owner.
DNS CAA Records
No CAA records found. Without CAA, any Certificate Authority can issue certificates for this domain. Adding CAA records restricts issuance to authorized CAs only, reducing the risk of misissued certificates.
DNS Configuration
Strengths: 4 nameservers configured (ns-1247.awsdns-27.org., ns-162.awsdns-20.com., ns-1877.awsdns-42.co.uk., ns-1021.awsdns-63.net.); 5 MX records present; Zone transfers properly restricted. Issues: DNSSEC not configured — DNS responses can be spoofed.
Security Headers
3/5 security headers present. Missing: Referrer-Policy, Permissions-Policy.
security.txt (RFC 9116)
No security.txt found. Publishing a security.txt at /.well-known/security.txt is the industry standard (RFC 9116) for vulnerability disclosure policies. Its absence may indicate a less mature security program.
Cookie Security
Strengths: 1 cookie(s) analyzed; All cookies have Secure flag; All cookies have HttpOnly flag. Issues: 1/1 cookie(s) missing SameSite attribute (_note_session_v5).
MX Records & Mail Provider
Strengths: Mail handled by Google Workspace; 5 MX record(s) configured; Multiple MX records provide redundancy.
TLS Protocol Support
Strengths: TLS 1.3 supported; TLS 1.2 supported; TLS 1.3 supported (strongest). Protocol support: TLS 1.3: Yes, TLS 1.2: Yes, TLS 1.1: No, TLS 1.0: No.
TLS Configuration
TLSv1.3 negotiated with TLS_AES_128_GCM_SHA256 (128-bit). Strong configuration with no deprecated protocols or weak ciphers detected.
DMARC / Email Security
Strengths: DMARC policy set to quarantine; SPF record present with hard-fail (-all); DKIM configured (selectors: s1, s2, zendesk1, zendesk2).
HSTS Header
HSTS enabled: max-age=31536000s (365 days). Missing includeSubDomains — subdomains not covered. Missing preload directive.
Known Breaches
No known breaches found in public disclosure databases.
CVE Exposure
Detected technologies: Proxy/CDN. (Proxy/CDN detected but excluded from CVE matching — upstream infrastructure). All detected technologies are upstream CDN/proxy infrastructure. No application-level software versions exposed.
Certificate Hygiene
Strengths: Certificate valid, 230 days remaining; Issued by GlobalSign nv-sa. Note: Wildcard certificate in use (*.domain) — covers all subdomains. Common practice; worth noting that compromise would affect all subdomains.
Recommended actions
2 items
Steps to improve note.com's security grade, ranked by impact.
1
Enable DNSSEC on your domain
Without DNSSEC, DNS responses for note.com can be spoofed, potentially redirecting users to malicious sites. This requires coordination with your domain registrar to publish DS records.
Compliance impact
NIST 800-53SC-20
Secure name/address resolution service
How to fix this
1
Check if your DNS provider supports DNSSEC (Cloudflare, Route53, etc.)
2
Enable DNSSEC signing in your DNS provider dashboard
3
Add the DS record to your registrar for .com TLD
4
Verify: dig +dnssec note.com
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2
Add optional security headers (Referrer-Policy, Permissions-Policy)
note.com has most security headers configured. Missing: Referrer-Policy, Permissions-Policy. These are best-practice additions that reduce the attack surface for client-side vulnerabilities.
How to fix this
1
Add: Referrer-Policy: strict-origin-when-cross-origin
2
Add: Permissions-Policy: camera=(), microphone=(), geolocation=()
3
Verify with: curl -sI https://note.com | grep -iE 'content-security|x-frame|x-content|referrer|permissions'
At a glance
Key data points from the scan.
TLS Version
TLSv1.3
TLSv1.3 negotiated with TLS_AES_128_GCM_SHA256 (128-bit). Strong configuration with no deprecated protocols or weak ciphers detected.
DMARC Policy
p=quarantine
Strengths: DMARC policy set to quarantine; SPF record present with hard-fail (-all); DKIM configured (selectors: s1, s2, zendesk1, zendesk2).
SPF Record
Present
v=spf1 include:amazonses.com include:mail.zendesk.com -all
Security Headers
3/5 present
Missing: Referrer-Policy, Permissions-Policy
HSTS
Enabled
HSTS enabled: max-age=31536000s (365 days). Missing includeSubDomains — subdomains not covered. Missing preload directive.
SSL Certificate
Valid
Strengths: Certificate valid, 230 days remaining; Issued by GlobalSign nv-sa. Note: Wildcard certificate in use (*.domain) — covers all subdomains. Common practice; worth noting that compromise would affect all subdomains.
DNSSEC
Not enabled
Strengths: 4 nameservers configured (ns-1247.awsdns-27.org., ns-162.awsdns-20.com., ns-1877.awsdns-42.co.uk., ns-1021.awsdns-63.net.); 5 MX records present; Zone transfers properly restricted. Issues: DNSSEC not configured — DNS responses can be spoofed.