Say I own the domain dissolved.com (purchased through network solutions). This is my external domain name. I will be hosting a webserver.
For my internal network, (windows 2003 Server with AD), it's named dissolved.com as well.
I plan to have a separate DNS server for each, for security purposes. I will have an external DNS server (in my DMZ) so outside people can find my webserver). I will also have an internal DNS server in my internal network, so name resolution can be completed amongst internal users
My goal, is that internal users (with email addresses of email@example.com), can send and receive email to the internet.
What do I need to accomplish this?