Why does VerticalResponse change the links within my email?

In order to track clicks VerticalResponse encodes every link in in your email; these will start with cts.vresp.com. When recipients click these links our servers track the click and render the correct website.
 
Additionally VR will include a number of variables at the end of each of your URLs if you enabled Google Analytics within your account and selected this option prior to launching your email.