Hello! I haven't install ISPconfig yet, because I'm wondering if there are any setting that you can set up so a client only can set up a sub domain to my domain name?
You can restrict a client so that he can only create subdomains to a domain that you assiged to him. But this rquires that the client has this doman assigned. But what you can do is that you create the sub domain websitesa as administrator for the client or use the remote API. as long as you set the website limit to 1 in the clinet settings, then the client can use this site but he cant create other sites nor can he delete this site.