Thanks @codes9
I think I understand now. a couple of questions:
- instead of adding on each email can I add it to the custom email headers in the config so that it appears on every email automatically?
- i get everything apart from the http://www.example.com/unsubscribe.html bit. how do I create the URL? this is dynamic right? (it will be different for each user)
thank you for you help this is really useful