title: Create a link that automatically fills a field on the target page
body: <p>I'm coding a newsletter and the guy that asked me to do it wants a link in it...all perfect no problems...</p>
  
  <p>Now the problem is that when you click on this link it goes on a page with fields and the guy asked me if it's possible to automatically fill up one of the fields.</p>
  
  <p>The page is a subscription page for some services and this guy wants me to fill up the referral field automatically when you land on the page with his email. Is it possible?</p>
  
  <p>Thanks heaps</p>