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Level 4

I'm not familiar with this sandbox environment, but Tracking server have to receive http request to count a click. In other words: you need to open link that goes to tracked URL in a web browser. You can try to copy link's URL from email and open it in your browser. URL should look like http://t.<your domain>/r/?id=hbae5f78,100b455f,101c8e5f (or similar).