Open rate is a commonly used email marketing metric that refers to the percentage of recipients who opened an email message. It is calculated by dividing the number of unique opens by the number of delivered emails, and is often used to measure the effectiveness of an email campaign and the interest of the audience.
A high open rate is generally considered a positive sign, as it indicates that the subject line and preheader text were effective in capturing the attention of the recipient. However, it is important to note that open rate alone does not necessarily indicate the success of a campaign. For example, an email with a high open rate may not necessarily lead to a high click-through rate or conversion rate if the content of the email is not engaging or relevant to the recipient.