All sites must now comply with Certificate Transparency requirements, does yours?
Expect-CT Reports can be setup on your site with a single line of code or config and you should always hope to receive no reports.
A single HTTP Response Header is all that is required to enable this powerful monitoring.
If a user is receiving a browser warning and unable to access your site, the browser will now dispatch a report to let you know.
If this is reliably happening on your site, and you're receiving a large volume of these reports, it indicates a big problem for your users.
Alongside enabling Expect-CT Reports, you may like to further improve your security.
Monitor and ensure that all emails you send are delivered securely.SMTP TLS Reports
Track the issuance of new certificates for all of your domains.CT Monitoring