Adding an Email account in Mail.app
Step 1: Open Mail Preferences

Click on the Mail menu and select “Preferences”
Step 2: Add Email Account

Click the + sign to add a new email account
Step 3: Enter Basic Account Information

Type in your name, email address and password. Then click the “Continue” Button.
Step 4: Enter Incoming Server information

Select POP or IMAP from the Account Type menu. Enter in a descriptive name for the account. Enter the incoming server, username and password that you were assigned or if you changed your password through webmail, use that password instead. Then click the “Continue” Button.
Step 5: Enter Outgoing Server information

Enter in a descriptive name for the account. Enter the outgoing server, username and password that you were assigned or if you changed your password through webmail, use that password instead. Click to check “Use only this server” box. Click to check the “Use Authentication” box. Then click the “Continue” Button.
Step 6: Account Summary

You should have a dialouge box similar to this one. Click to check the “Take account online” box if not already checked. Then click the “Create” button.
Step 7: You are Done!

Note the newly created email account in your list. Click the red X in the upper right hand corner of the window to close.