Cname And Website Help Please

Can anyone tell me if I wanted to setup a Intranet and the intranet company sent us this email and said if we wanted to have private label intranet we have to adjust our CNAME settings with our host.
It is because, ONLY FOR THIS DOMAIN, we want to use their business email servcie i.e XYZ@***.com

Can anyone please tell me if by changing CNAME, we still can build our own website at www.***.com

 

 

 

 

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