I am having several partners drive traffic to a webinar, so I'd like to give each of them an email that has their register button include a URL parameter unique to them.
Ex: http ://info.landesk.com/event-name.html?r=partner1
On the registration form is a hidden field, Referred By. The Get Value from is URL Parameter, and the Parameter Name is r. I send myself a test email by way of a smart campaign (not a send sample), and when I click the link I can see the correct parameter in the URL of the landing page. However when complete the form, my Referred By field remains blank. Any ideas what I'm doing wrong?