Open
Cached
·
just now
99/100
SECURITY SCORE
Certificate Information
Subject
CN=www.mailhardener.com
Issuer
C=US, O=Let's Encrypt, CN=E7
Valid From
November 25, 2025
Valid Until
February 23, 2026
42 days
Public Key
ECDSA
256 bit
(P-256)
Adequate
Signature Algorithm
ECDSA-SHA384
SHA-256 Fingerprint
AA:2D:7C:F4:AC:65:4B:30:C1:C2:C0:B9:AF:0E:BE:DA:2E:3C:72:AA:15:B4:FE:B1:2C:58:A0:DA:D0:D3:56:A5
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
frame-ancestors; default-src; object-src; +4 more
frame-ancestors 'none'; default-src 'self'; object-src 'none'; script-src 'self' stats.mailhardener.com; img-src 'self' data: stats.mailhardener.com; connect-src 'self' stats.mailhardener.com https://api.mailhardener.com sentry.io; report-uri https://o226634.ingest.sentry.io/api/4505041461051392/security/?sentry_key=e70454ab4a4d463e82999b7c94880837
X-Frame-Options
Excellent
DENY
X-Content-Type-Options
Good
nosniff
Referrer-Policy
Good
no-referrer
Permissions-Policy
Present
accelerometer=(), camera=(), geolocation=(), gyroscope=(), magnetometer=(), microphone=(), usb=(), midi=(), sync-xhr=()
CAA Records (Certificate Authority Authorization)
CAA Records
Configured
(Restricts certificate issuance)
Current Issuer
Authorized
(Matches CAA policy)
Authorized CAs
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