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SECURITY SCORE
Detected Technologies
Certificate Information
Subject
CN=mail.dux.tech
Issuer
C=US, O=Let's Encrypt, CN=YR1
Valid From
August 01, 2026
Valid Until
October 30, 2026
53 days
Public Key
RSA
3072 bit
Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
AC:D1:EB:CE:60:5E:73:63:1E:80:AB:31:1D:18:74:82:F9:C8:5F:07:6C:C8:15:B0:EE:13:13:FC:F3:5C:EB:97
Alternative Names
Security Configuration
TLS Protocols
TLS 1.2
TLS 1.3
Forward Secrecy
Supported
(Modern clients use PFS)
HTTP Security Headers
Status
Strict-Transport-Security
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
- • Add Strict-Transport-Security header with max-age of at least 1 year
- • 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