Add Host A Record in DNS Manager Microsoft Windows Server 2012
Host A Record DNS Manager
Open DNS Manager in windows server 2012
1- Expand Forward Lookup Zones and select your external domain (xpertstec.com) On the right side imply place right-click and then select New Host (A or AAAA).
2- In the Name, field type the first name on your certificate. within the IP address field type the interior IP of your Exchange server. for instance, it is 10.0.0.24 Click Add Host
3- The host record created successfully and then click ok.
For more details click here
