Adding a forwarding rule in WSP is a fairly quick and easy process.
Once logged in, you will see an option called “Mail”. Hover the mouse over that option and click on "Accounts"
You will then see a list of email accounts that has been created on your hosting package. Click on the one that you wish to add a forwarding rule to.
The forwarding option can be found at the bottom of the new page. Click on the save option once you have entered the address you wish to forward your emails to.
If you wish to have the email that was sent to mailbox 1 to be deleted after forwarding it to mailbox 2 then tick the "Delete Message on Forward" before saving.