Open
Cached
·
just now
98/100
SECURITY SCORE
Certificate Information
Subject
CN=mailmerc.com
Issuer
C=US, O=Let's Encrypt, CN=R12
Valid From
October 27, 2025
Valid Until
January 25, 2026
54 days
Public Key
RSA
2048 bit
Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
19:DC:BA:F6:64:29:90:38:86:E6:5B:FE:8A:E9:72:0B:50:98:F1:1B:39:AD:5F:CE:69:10:C4:AB:F6:56:E6:3F
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
Excellent
max-age=63072000; includeSubDomains; preload
Content-Security-Policy
Strong
default-src; script-src; style-src; +14 more
default-src *; script-src *; style-src *; img-src *; font-src *; connect-src *; media-src *; object-src *; child-src *; frame-src *; worker-src *; frame-ancestors *; form-action *; reflected-xss filter; base-uri *; manifest-src *; referrer origin
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Good
no-referrer-when-downgrade
Permissions-Policy
Missing
Not configured
Recommendations
- • Consider adding Permissions-Policy to control browser features
CAA Records (Certificate Authority Authorization)
CAA Records
Configured
(Restricts certificate issuance)
Current Issuer
Authorized
(Matches CAA policy)
Authorized CAs
Incident Reporting
mailto:[email protected]
Recommendations
- • Consider using critical flag (flags=128) for stricter CAA enforcement
- • Consider adding 'issuewild' records to control wildcard certificate issuance