Your connection is not fully secure – message

Message: Your connection is not fully secure

If you see this message you need to update your web browser (email client) to the latest version.
At least TLS version 1.2 is required, TLS v 1.3 is the current version.

The problem can also occur if you have not activated an SSL certificate for your website to use https.
You can request a SSL certificatet in your ControlPanel under Domains > Letsencrypt.