If you have a Google Analytics account set up for your website, it can also be used to track the opens of an email.
The URL of the image contains all the information necessary for Google Analytics to understand what account you’re using.
How to embed:
<img src="http://www.google-analytics.com/collect?v=1&tid=UA-32031717-1&cid=12345678&t=event&ec=email&ea=open&el=open_email&cs=newsletter&cm=email&cn=YourCampaign Name">
Google Analytics dashboard will show response as soon as email is opened by the receiver.
So log into Google Analytics and open up your Real Time reports to see people opening your emails in real time. Can I get a “woop-woop?”