Mountain Lion push email - server name best practice

Would anyone be able to guide a newbie with advice on server naming for a mac mini? 😊

I have a public web presence but want to direct incoming email through the server for push email to iOS devices, i.e iPhones. The server will also be a VPN to the internal network, which will be running a hybrid of mac and win7 clients. The company webserver will remain at the webhost.

Should I simply call the host machine server.mydomain.com or for example, mailserver.mydomain.com? I have read some wiki's and advice for naming conventions that have left me confused. I think I can handle the setting up of the CNAME, A and MX records. But on the latter point, if someone has a simple English reference they want to offer up, then I would be most grateful.

I want to adopt a sound strategy as my first foundation stone. Or am I paranoid with this parameter?

Many thanks in advance.