Please find this prospect on your account and check whether in the Open column you see the blue eye symbol. It means that your mail has been opened.
Also, you can check which mail has been opened in the sequence. After clicking on the prospect name you'll see the Prospect details and in the Logs tab there is the sending history with the results of open tracking at every message. Remember that open rate is a vanity metric and tells you only how good your subject and opening line are. Read more…