The Message Center is a central repository that allows you to view and read all of your personal e-mails, system alerts, and portlet-specific messages that may have been sent to you through the portal. The Message Center is available on the My Pages tab after you click on the My Pages tab for the first time and walk through the My Pages wizard. Click on the Message Center link on the sidebar in the My Pages context.
You can create a single sign-on to your Yahoo, Hotmail, or Gmail system by following these steps:
Click on Manage, Manage Email Accounts from the toolbar of the Message Center portlet.
Click on the 
Add a New Account link.
Select your e-mail provider from the drop-down menu.
Enter your user name and password.
Click on the Add button.
After you have defined one or more of your e-mail accounts, you can select one to be enabled by clicking on the corresponding radio button.
Your messages from the enabled e-mail provider are now displayed in the Message Center.