This tutorial will walk you through the simple steps of configuring custom SMTP settings to use your GMail hosted email account.
From the Settings>Email & Notifications menu, click on the SMTP Settings tab.
Enter the following settings:
SMTP Hostname: smtp.gmail.com
SMTP Username: Your GMail Email
SMTP Password: Your GMail Password
SMTP Port: 587
Use SSL: Yes
Once you have entered your information, click the "Test Settings" button to ensure your credentials are correct. Click the "Save Settings" button to commit the changes.