One of the programs that comes with Mac OS X is Mail which allows you to set up and receive emails. Mail has a lot of features that integrate with other applications such as Address Book, iCal, and Safari. Mail has a built in learning junk mail filter to reduce the amount of spam that you receive.
To configure Mail, you first must open the application.

If this is your first time using Mail, you are presented with the opening screen. If you already are using Mail to check another email, please skip ahead.
Enter your information as shown in the image below.
Full Name: Your Full Name
Email: Your Full Email
Incoming Server: mail.uwm.edu
Account Type: imap
Username: Your UWM username
Password: Your UWM password
Outgoing Server: mail.uwm.edu
You will then be prompted to import messages from other email clients. If you have used another email client previous to Mail (webmail, hotmail, etc., do not count), click "yes." Otherwise, click "No."
You will then be presented with a Welcome screen. Click "No" to continue. If you wish to learn more about the Mail program, click "yes." You can always view "What's new" from
the help menu.
Finally you are at the main screen.
If you have already configured your UWM account, please skip to the next section, otherwise continue here to configure your UWM account.
Select "Preferences" from the Mail menu.
Click on the "Accounts" button to get to the "Accounts" window.
Click on the plus sign to add an account
Enter the following information in the fields:
Full Name: Your Full Name
Email Address: Your Full Email
Incoming Mail Server: mail.uwm.edu
Account Type: imap
User Name: Your UWM username
Password: Your UWM password
Outgoing Server: mail.uwm.edu
Apple has its own article on this which can be found at http://www.apple.com/macosx/features/mail