I use the webclient. I set (opens to look):
if ALL of these conditions are true:
Subject contains RIM_bca28a80-e9c0-11d1-87fe-00600811c62
Body contains This message is used to carry data between the BlackBerry Handheld and an associated server.
From contains [left blank]
Then do the following with the message:
Blackberry Web Client
Move to folder: Deleted Items
Do not forward messages to handheld
that's how it's set on the web client login for filters.