The Forwards application allows you to manage mail forwards. A
  mail forward lets you redirect your mail to another mail
  address (or a comma separated list of addresses if you wish).
  You can even forward to another address and keep a copy in your
  local mailbox.
Enabling a forward
Check the Set/Install checkbox to 
  indicate that you
  desire to create a forward, and then enter the address(es) in
  the text box provided. If you want to forward to more than one
  address, separate the addresses with commas.
Note: 
  If there is an existing vacation or forwards setup, it will be
  replaced by the new forward setup you create here!
If you want to keep a copy of the messages in your local
  INBOX as well as forward them to a remote address, then check
  the check box for Keep a copy in your local
  mailbox?".
When ready to submit the forward, enter your password into
  the password box, and press the Submit
  button. At the top of the new page, there will be a message letting you know
  if the new forward was set or not.
Disabling a forward
When the forward is no longer needed, you can disable it by
  checking the Unset/Remove a forward
  checkbox, entering your password in the password box, and submitting the
  form. At the top of the new page there will be a message letting you
  know if the new forward was set or not. Removing the setup
  stops any further messages from being forwarded.