95/100 SECURITY SCORE

Certificate Information

Subject
C=DE, ST=Rheinland-Pfalz, L=Montabaur, O=IONOS SE, CN=webmail.kundenserver.de, UNKNOWN={:asn1_OPENTYPE, <<19, 20, 80, 114, 105, 118, 97, 116, 101, 32, 79, 114, 103, 97, 110, 105, 122, 97, 116, 105, 111, 110>>}, UNKNOWN={:asn1_OPENTYPE, <<19, 2, 68, 69>>}, UNKNOWN={:asn1_OPENTYPE, <<19, 15, 82, 104, 101, 105, 110, 108, 97, 110, 100, 45, 80, 102, 97, 108, 122>>}, UNKNOWN={:asn1_OPENTYPE, <<19, 9, 77, 111, 110, 116, 97, 98, 97, 117, 114>>}, UNKNOWN=HRB 24498
Issuer
C=DE, O=Deutsche Telekom Security GmbH, CN=Telekom Security ServerID EV Class 3 CA
Valid From
July 04, 2025
Valid Until
July 08, 2026 233 days
Public Key
RSA 3072 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
F1:49:D8:F1:61:28:1A:19:4D:DA:84:0F:0B:47:54:2A:BC:38:A2:B7:4D:9C:FC:0F:A9:36:7C:D4:83:74:A8:99
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
Good
max-age=31536000 ; includeSubDomains
Content-Security-Policy
Strong
default-src; img-src; font-src; +8 more
X-Frame-Options
Good
SAMEORIGIN
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Good
strict-origin-when-cross-origin
Permissions-Policy
Present
accelerometer=(), ambient-light-sensor=(), autoplay=(), battery=(), camera=(), cross-origin-isolated=(), display-capture=(), document-domain=(), encrypted-media=(), execution-while-not-rendered=(), execution-while-out-of-viewport=(), fullscreen=*, geolocation=(), gyroscope=(), keyboard-map=(), magnetometer=(), microphone=(), midi=(), navigation-override=(), payment=(), picture-in-picture=(), publickey-credentials-get=(), screen-wake-lock=(), sync-xhr=(self), usb=(), web-share=(), xr-spatial-tracking=()
Recommendations
  • Consider adding 'preload' to HSTS for maximum security

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