Understand what your site is showing
Your site publishes more than you think: headers, certificates and domain records anyone can read from outside. Each guide explains one of those signals and links to the check SiteGuardia actually runs.
Security headers
What HTTP security headers are, and which ones matter
Every page your site serves arrives with a set of instructions for the browser. Five of them change an outcome on a small-business site. This is what each one tells the browser to do, and the one mistake most Content-Security-Policy deployments make.
See the explanation and the checkHTTPS and TLS
Why a site can use HTTPS and still be misconfigured
The padlock proves a certificate validated. It says nothing about protocol versions, cipher strength, chain completeness or how long the certificate has left.
Email domain security
SPF, DKIM and DMARC, and which one actually stops impersonation
Three records, three jobs. Only one of them tells a receiving server what to do when a message fails, and rolling it out in the wrong order breaks your newsletter.
How something becomes a finding
The guides explain the signals. The methodology explains the judgement: what is observed, what is never claimed, and how the index is calculated.
Read the methodologyThis check is part of the full reading. Entering an address runs all five categories.