I get the following messages sent to my desktop and to my Blackberry all the time.
From Subject Received Size Categories
RIM_bca28a80-e9c0-11d1-87fe-00600811c6a2 Tue 9:11 PM 6 KB
The body of the message says that the server will clean these up, but it never does. I have to manually delete the messages from both my desktop and my Blackberry.