Apple launched an interesting initiative. It offers procedures to setup and configure your Mail account, a task not necessarily easy for all users, especially if pop, imap or smtp servers does not ring a bell for you. All information can be found hereafter: http://www.apple.com/support/macosx/mailassistant
You then have to enter the email address that will help Apple to identify the ISP and the associated services and servers used. If the procedure is only available in english and supposed to be working only in USA, it works fine with 3 French ISPs (Free, Orange or SFR).
Next step, include this function in Mail.