DNS Gurus

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 mail.yandex.ru, posta.yandex.com.tr, xn--80a1acny.xn--d1acpjx3f.xn--p1ai, mail.ya.ru, mail.yandex, mail.360.yandex.kg, mail.360.yandex.ee, mail.360.yandex.uz, mail.360.yandex.tm, not for mail.koruq.com

Cached · just now
75/100 SECURITY SCORE

Certificate Information

Subject
C=RU, ST=Moscow, L=Moscow, O=YANDEX LLC, CN=mail.yandex.ru
Issuer
C=BE, O=GlobalSign nv-sa, CN=GlobalSign RSA OV SSL CA 2018
Valid From
October 10, 2025
Valid Until
April 09, 2026 78 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
FE:84:DA:07:A4:45:47:6C:02:F4:26:28:4C:CE:81:2E:47:EC:10:9B:EF:5C:FE:F7:32:0E:26:7B:14:1E:0E:A8
Alternative Names
40 domains

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
Missing
Not configured
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-Frame-Options: DENY or SAMEORIGIN to prevent clickjacking
  • • 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