We recently created a new domain called “testusa.com”. We are running one Windows Server 2008R2 DC which is acting as the DNS server. Our current external mail provider has us use the address “mail.testusa.com” for our web-based email and for configuring Outlook settings. The matching of the domain and the mail provider’s given address was unintentional. If I use the Domain Controller’s internal IP as the primary DNS server for our workstations, they fail to navigate to the mail provider. If I manually set the workstations to only use external DNS server’s, they correctly navigate to the email provider. How can I have the workstation correctly use the DC as their primary DNS server, but also have them navigate to the email provider? Any help would be great appreciated!