Poco Script FAQ - Removing a script from automatic execution

Poco Script FAQ - Removing a script from automatic execution

Q: A certain script is running whenever new mail arrives. How do I stop it from running, I'd like to run it only against selected messages.
 
A: You must have configured the script to run against incoming messages. To remove this setting:
  1. Open the "Filters" window by pressing F4 or by selecting "Filters..." from the "Tools" menu.
  2. Press the "Incoming" tab if it's not already selected.
  3. Look for an entry that runs the script. This may be difficult to find if the "Run Script" action is not the first action, you may have to resort to editing the individual filters. Assuming you do see this script listed then select it and press the "Delete" button below the box or disable it.
  4. Close the "Filters" window.

Check here for information on running scripts against selected messages.