DNS Gurus
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83/100 SECURITY SCORE

Certificate Information

Subject
CN=mail.stonemapping.fr
Issuer
C=US, O=Let's Encrypt, CN=E7
Valid From
December 05, 2025
Valid Until
March 05, 2026 88 days
Public Key
ECDSA 384 bit (P-384) Strong
Signature Algorithm
ECDSA-SHA384
SHA-256 Fingerprint
50:E7:2D:0F:F8:AA:B0:72:B2:52:6E:16:61:18:1E:43:90:BD:0C:23:24:64:D7:E4:2A:4B:6C:B8:06:08:B2:AE
Alternative Names
4 domains

Security Configuration

TLS Protocols
TLS 1.2 TLS 1.3
Forward Secrecy
Supported (Modern clients use PFS)

HTTP Security Headers

Status
Strict-Transport-Security
Good
max-age=31536000; includeSubDomains
Content-Security-Policy
Missing
Not configured
X-Frame-Options
Good
sameorigin
X-Content-Type-Options
Missing
Not configured
Referrer-Policy
Missing
Not configured
Permissions-Policy
Missing
Not configured
Recommendations
  • • Consider adding 'preload' to HSTS for maximum security
  • • Add Content-Security-Policy header to prevent XSS attacks
  • • Add X-Content-Type-Options: nosniff
  • • Add Referrer-Policy header (recommended: strict-origin-when-cross-origin)
  • • Consider adding Permissions-Policy to control browser features

CAA Records (Certificate Authority Authorization)

CAA Records
Not Configured (Any CA can issue certificates)
CAA Issues
  • • No CAA records configured - any CA can issue certificates
Recommendations
  • • Implement CAA records to restrict which CAs can issue certificates for your domain
  • • This adds an extra layer of security against unauthorized certificate issuance
  • • Example: Add CAA record 'example.com. CAA 0 issue "letsencrypt.org"'
  • • Consider adding 'iodef' record to receive security incident reports