You’re ready to use Google Apps for Email for your domain and you’d like to set it up on your Mac. If you are using only one device (a computer and not also a phone or laptop), you could be using POP.
Kenji Oshima, The Compassionate Computer Geek is guest posting today with this video–as well as the IMAP version. Here’s a bit more to help you with the difference between POP and IMAP.