This tutorial demonstrates how to configure Apple Mail on Macintosh for @colorado.edu Gmail accounts.
You may need to enable IMAP for your account prior to configuration of your email client (https://mail.google.com). To do this:
From the File menu, select Add Account...
In the Full Name: text field enter your desired display name.
For the Account Type select IMAP, and for Incoming Mail server type imap.gmail.com
In the Outgoing Mail Server field type smtp.gmail.com
Check the Use Authentication box.
Click the Create button and your account will be configured.
Some users may need to change their app security settings when using non-google/android email programs. While signed into your Gmail account in a browser, open the Google Apps menu, then select My Account.
*Note: You should try to connect your account without changing these settings and change only if the previous steps don't work.
In the Sign-in & Security section, select Connected apps & sites.
Scroll down to the Allow less secure apps section and change the setting to On. You should now be able to connect your account to an email client.