Open Rate

The Open Rate is the percentage that shows you how many emails have been opened in your email marketing campaign or newsletter. You can easily calculate this by dividing the number of emails opened by the number of delivered emails. Please keep in mind that the number of delivered emails is different from the number of sent emails, as the latter also includes the bounced emails. This is a great metric to measure the effectiveness of your subject line or the overall reputation of your brand. 
Email AnalyticsEmail Marketing