title: Determine whether a user came from an email, and if so which client
body: <p>Before I get a spam of comments saying this shouldn't be done, I'm using it as a 'nice to have' with plenty of ux thought going into getting them to the right page if I sniff the referrer incorrectly.</p>
  <p>Anyway, I have the following questions:</p>
  <h2>Can you sniff via https (gmail mainly). Are you able to get a referrer off an https domain if you, yourself also have an ssl?</h2>
  <h2>Do local clients, such as outlook 2013 and thunderbird, give off a referrer when a user clicks the link?</h2>
  <p>-Led</p>