Groupsites feature the ability for members to communicate one-on-one via private messages. Private messages can be sent from within your Groupsite, or created and replied to directly from an email account. Besides your email inbox (provided by your GMail, Yahoo!, etc. or your company's email service provider), you can also view sent and received Private Messages directly from your Groupsite.
Just log-in to your Groupsite. Then go to My Settings > My Private Messages.
Your My Private Messages page will load .
Click the Sent or Received button at the top of the page to toggle between views of your sent and received messages.
Click the Title of the message to view the message and Sender name to view the member's profile.