I have created an email account with zoho maill for smambulanceservice.com (Email: admin@smambulanceservice.com) with Bluhost old server.

Now i have pointed my domain to new server Hostgator.  

How do i Modify Record in new registrar Hostgator for Email to work . Please Guide me.  

Old Server : Bluehost

New Server: Hostgator (Requird confiuration steps)