Hello, I have installed ISPConfig with only one domain, but I noticed that google has indexed mail.midomain.com and server.mydomain.com. When I access it I have the same content as the main domain. Since I can block access to these subdomains?, I have never created a subdomain in the panel. I have also removed the mail name in the panel DNS in ISPconfig, but I still have access to it. Do you need any other information? Thank you!
On the first page of the website preferences, have you set the option "Auto-Subdomain" to "*" ? That would deliver the page at all subdomains DNS is usually cached and takes some time (up to 48h) to propagate, depending on your settings (TTL of DNS server, but also some Routers like Fritzboxes cache DNS)