Breno,
Are there any simpler ways you can think of to restrict access to a landing page and its content unless an email is present in the system?
I didn't get what you'd meant by "follow up page can be defined as external, referencing the URL ...Add an URL parameter and then in the follow up page use jQuery to check whether that parameter is present and correct."
I was wondering if segmentation is the way to go? If email is true include? Not sure what to do as I dont know java script.
thanks
Bill