Yes, you must have manager access on the user's mailfile for this. Open the design of the user's mailfile and you will only see the public agents. Now create your own private agent in the user's mailfile. Close and re-open the user's mailfile, and you will now see all private agents! Now you can safely turn the agent off and remove your dummy agent. If you have to stop a currently running agent, you may want to restart the Amgr on that server (be sure not to kill any other concurrent running agent).