Definition
Open rate
Open rate is the percentage of recipients who open an email out of those it was delivered to. It signals how compelling your subject lines are and how engaged your audience is. A healthy open rate means people recognize and want to read your messages.
Open rate measures attention at the first step: did the recipient open the email at all. It reflects how well your subject line and sender name earn a click to open, and how interested your audience is in hearing from you.
A low open rate suggests weak subject lines, a disengaged list, or deliverability trouble. Improving it, through clearer subject lines, relevant content, and a clean, consented list, ensures more of your carefully written messages actually get read.
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