This feature is used when you want to permit another user access to your current user's mailbox. A delegate has the following access to the user's mailbox:
Read, send, and delete emails
Access the user's contacts via Gmail
Select To, Cc, or Bcc links in the mail compose window
A delegate CANNOT change the user's account password, settings, or chat
Enter the delegate's email address in and then click Add Account Delegate.
Click the X next to the delegate you would like to remove.