Go to your BWC.
Choose the Filters Tab.
Give the Filter a name No spaces in the name ex: Do_Not_Forward_to_BB.
Under the Following conditions choose If Any instead of If All.
On The first Life :"From Contains: Place in the box the exact e-mail address you do not want forwarded, ex:
Then finally under the Handheld portion change the default from Forward to handheld to Do not forward by clicking on the radio dial button and making sure it changes to a green dot.
Finally go to the top and click on the button that says save and close. That should do it.