By default, domains created in Plesk use the Plesk DNS server for name
resolution. However, in some situations this is not desirable. For
example, if you are using a third-party DNS server or servers that are
authoritative for your domain, it is recommended to disable the Plesk
DNS service for the domain. To do so, go to Websites & Domains >
DNS Settings and click Disable. If, at a later time, you change
your mind, click Enable to switch the Plesk DNS service for the
domain back on.
While the Plesk DNS service for a domain is disabled, you can check
whether the DNS records stored on the third-party DNS server are
correct. To do so, go to Websites & Domains > DNS Settings,
click Add Record, type in the domain name of the third-party DNS
server, and click the 
icon next to the name of the DNS
server you have just added. Plesk will retrieve the list of DNS records
from the third-party DNS server, compare them to the DNS records for the
domain stored in the Plesk database, and warn you of any discrepancies.