Cant see company website from LAN.

Guy Please take and easy and bear with me, because I am fairly new to this process.
Okay to I have setup a network for my office. Consisting of 1841 Cisco Router. Configured 192.168.1.1 default gateway, first 50 IP addresses are set Static and rest 300 on DHCP. I have also deployed an exchange/DNS on static IP address 192.168.1.5. DNS server name is Angarai-intl.local. The router is configured 192.168.1.5 on primary DNS and 4.2.2.2 secondary DNS to be pick up on DHCP pool. The exchange and AD seems to be working perfectly fine when workstation connects using DHCP, as well as statically when the primary DNS is set on 192.168.1.5 which is my domain hosting exchange and ad etc. However when logged on the LAN using 192.168.1.5 as primary DNS users cannot see the company website which is angarai-intl.com. Outside the network is works perfectly fine. Or if I change the primary DNS to 4.2.2.2 and secondary to 192.168.1.5 I can see the web site. But then the exchange does not connect. I have checked everything that I could and came up to the conclusion that I need to change something on the local DNS/Exchange server . Need guidance in that. Please help. My webserver IP address is 64.20.57.194.