For each mailbox, you can set the forwarding to any other mailbox. You can choose whether to delete the forwarded message or stay in the mailbox where it was sent.
You can also redirect email to more mailboxes at once, just separate each mailbox with a semicolon (;).
Redirecting an email
Just log in to the Customer Center and go to the Email section under the domain where you have the mailbox created by clicking Settings.
You can set redirect, change quota, or set an automatic answer or alias in the settings for that mailbox.