We have three servers, a DC, Mail, and TS. Right now the DC is the primary DNS server. It was set up to have the TS as the secondary but I would like to change it to the mail server. DNS syncs between the DC and TS no problem, but when I look at the Mail servers DNS I see no Zones and under the event viewer are Event ID 4007 errors. Can someone explain to me how I can make the Mail servers DNS sync with the DC?