SSL Verification Bypassed
The server's SSL certificate could not be verified. The analysis was completed using insecure mode. Data may be less reliable.
Reason:
Hostname Mismatch - certificate is issued for excel6.space4server.com, not for mail.space4server.com
Open
Cached
·
just now
81/100
SECURITY SCORE
Certificate Information
Subject
CN=excel6.space4server.com
Issuer
C=US, O=Let's Encrypt, CN=R13
Valid From
November 24, 2025
Valid Until
February 22, 2026
54 days
Public Key
RSA
2048 bit
Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
7C:CC:47:1A:2C:D6:6A:02:7F:8E:A8:22:41:1D:76:E0:7F:2D:1A:4F:EF:9F:C2:29:8B:B8:05:6E:9D:89:F6:45
Alternative Names
Security Configuration
TLS Protocols
TLS 1.0
TLS 1.1
TLS 1.2
TLS 1.3
Forward Secrecy
Supported
(Modern clients use PFS)
Warnings
- • TLS 1.1 is deprecated and should be disabled
- • TLS 1.0 is deprecated and should be disabled
HTTP Security Headers
Status
Strict-Transport-Security
Missing
Not configured
Content-Security-Policy
Missing
Not configured
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
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 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