My infrastructure setup is like below:
I have a IP pool from my ISP (containing 5 real IP and I want to use one for mail server) My AD integrated zone is abc.xyz.co.in and my company name is xyz.co.in I have another DNS server which is connected to my LAN but not domain joined and where I can create DNS record to be reachable from outside. My internet is connected via a firewall and NAT is there. Kindly guide me what are the records I should ask to my ISP for entering to their DNS server and what are the DNS record I need to put into my external DNS as well as in my AD integrated DNS.