Many users at RISD have one or more mail accounts that they help manage. Google addresses this with a feature called Mail Delegation. With Mail Delegation users can access the other email inbox and send mail on the other accounts behalf. This is useful for users with multiple accounts to manage as well as users that would like to grant others access to their account to check mail and send messages.
http://mail.google.com/support/bin/answer.py?hl=en&ctx=mail&answer=138350 OR view the video below: