How to prevent a reseller from using "Create New Account" to create a subdomain account using another users domain name.
Example:
domainxxx.com is host by reseller-xxx,
but reseller-yyy can create account as domain sub.domainxxx.com
Example:
domainxxx.com is host by reseller-xxx,
but reseller-yyy can create account as domain sub.domainxxx.com