[redmodelt]

Have you tried setting your email so they go to your spam file? You should be able to open to read only and mark as spam. If your spam file is like mine, any emails over 30 days are auto deleated or I go in and check every so often and manually deleat. If it is a real organization (which doing a quick google search looks like it is), you should be able to unsubscribe without signing up. They have your email now anyway so even if you did sign up to quit, more then likely you would not be getting any more then you are now.