Switching Off the DNS Service
By default, Plesk server acts as a primary name server for all hosted domains. However, if you do not want to provide the DNS service, you can switch it off by clicking Switch Off in the Tools & Settings > DNS Template. Note that this will switch off the DNS only for domains created after you click the button. Additionally, subscribers of service plans that include the permission DNS zone management will still be able to switch on the DNS for their domains through the Customer Panel.
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