89/100 SECURITY SCORE

Certificate Information

Subject
CN=mail.ceely.com.tw
Issuer
C=US, O=Let's Encrypt, CN=R12
Valid From
December 12, 2025
Valid Until
March 12, 2026 69 days
Public Key
RSA 2048 bit Adequate
Signature Algorithm
SHA256-RSA
SHA-256 Fingerprint
24:00:84:6E:B4:A5:88:00:E6:0E:CC:84:B7:98:B7:C2:FE:14:8C:77:41:57:CD:36:20:BB:B4:37:AE:7B:FE:DC
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=64072000; includeSubDomains; preload
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 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
Configured (Restricts certificate issuance)
Current Issuer
Authorized (Matches CAA policy)
Recommendations
  • Consider using critical flag (flags=128) for stricter CAA enforcement
  • Consider adding 'iodef' records to receive notifications about unauthorized certificate issuance attempts
  • Consider adding 'issuewild' records to control wildcard certificate issuance

Subject Alternative Names

88 domains
mail.turn-byte.com

Other domains in certificate

mail.altimeter.com.br
mail.arceyuz.com
mail.argentoengineering.com
mail.biosaz.org
mail.blackboxsounds.com
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mail.ccdingenieria.com
mail.centum.ca
mail.centumcommercial.ca
mail.maison.co.id
mail.codencoit.com
correo.unitel.com.bo
mail.farmaco.com.py
mail.ceely.com.tw
mail.cubaemail.net
login.drivanramos.com.br
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info.lola.mv
mail.majorfilms.net
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webmail.vizpay.in
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mail.zentricgroup.ca
mail.zreconsultores.com