I have done all the pre work of generating tracking ID and am trying to add email opens tracking to my HTML email template. I have added
<img src=" http://www.google-analytics.com/collect?v=1&tid=UA-123456781&cid=CLIENT_ID_NUMBER&t=event&ec=email&ea=open&cm=email&cn=Campaign_Name " />
to the bottom of the template. I tested this in various clients and It is not firing anything in GA. Also, gmail seems to rejecting the entire src attribute. What am i missing?