Name a common metric used to measure email marketing success.

Open rate is a crucial metric in measuring email marketing success because it indicates the percentage of recipients who opened a particular email. This metric helps marketers gauge the effectiveness of their subject lines and overall email deliverability. A high open rate suggests that the subject line was compelling enough to entice recipients to open the email, reflecting their interest in the content or the brand.

In the context of email marketing, understanding open rates allows marketers to refine their strategies by testing different subject lines, sending times, and targeting practices, thus improving engagement with their audience. It serves as a key indicator of how well an email campaign is resonating with its intended recipients.

Other metrics listed, while important in their respective areas, do not directly measure email marketing success in the same way. For instance, customer acquisition rate pertains to overall marketing effectiveness in gaining new customers, website bounce rate relates to user engagement on websites, and social media engagement rate measures performance in social media contexts. Each of these metrics serves its distinct purpose but does not provide the same direct insight into email campaign performance as the open rate does.