Company has following simple network and server:
1. Linux Ubuntu Server running Apache web server contains two websites with two domain.
2. One broadband line with multiple true IP
3. DNS parking is on ISP, there is no DNS Server in office
4. broadband line direct plugin to Ubuntu Sever, so the IP is true IP number, not 192.x.x. or 10.x.x.x.
Apart from that, company would like to enable Ubuntu as email server (maybe a Postfix and DNS Server (BIND), I am not familiar DNS Server, so based above condition, is it possible to install email server only, if it really require BIND, what kind of DNS Server role I should configure?
Master Server role or Slave Server role or even Caching Server role, I don't have DNS server setup experience, pls advice. Thanks.