We haven an upcoming customer summit. The list is a very specific group of Senior level people and VIPs. My execs are adamant that the people on our invite list are the only ones who should be able to register. They are worried that the URL will be forwarded within our customer companies and that people who are not on our list will register. We don't want an awkward situation where we are turning people down, who are customers but were not on our list.
What is the best way to ensure that the form is only displayed / works for the people on our list?
I'm not sure the best way to begin thinking about how to set up our landing page and form to ensure only those who get the email to register are the ones who can do so.
Any help or ideas are greatly appreciated.