After upgrading to Tiger 10.4.11 (PPC) and applying Security Update 2007-009 SpamSieve no longer launches when spam messages are received in Mail or when its icon is double clicked in the Applications folder or in the Dock. Upon receiving spam messages Mail tries to launch SpamSieve and the following error message appears: Could Not Launch SpamSieve; Mac OS X reported error 5 when trying to launch SpamSieve.
I have downloaded a fresh copy of SpamSieve 2.6.5 and trashed the old one. The new copy likewise does not launch. The User/Library/Mail/Bundles folder contains only the SpamSieve.mailbundle folder.
I would be very grateful for your help.