This tutorial teaches how to create an email Forward. A Forward does not store incoming message, as a mailbox would, but instead routes the messages to the designated mailboxes. Consider the following situation as an example:
You wish to set up addresses like: firstname.lastname@example.org, email@example.com, and firstname.lastname@example.org. Yet, you do not want to check 3 different mailboxes. You can set up these addresses as Forwards, and have all their incoming email routed to one centralized mailbox. Alternatively, you can have each of these Forwards route to the appropriate person's mailbox in each department.