Which of the following metrics is NOT typically used to evaluate the success of an email campaign?

The correct choice highlights that search engine rankings are not typically used to evaluate the success of an email campaign. Email marketing metrics are focused on engagement and effectiveness related to the emails sent, while search engine rankings pertain to website visibility on search engine results pages, which is a different aspect of online marketing.

Open rates, click-through rates, and unsubscribe rates all serve as key performance indicators specific to email campaigns. Open rates measure how many recipients opened the email, click-through rates indicate how many recipients clicked on links within the email, and unsubscribe rates inform marketers about the percentage of recipients who opted out after receiving the email. These metrics are essential for assessing how well an email performs in terms of engaging the audience and maintaining a healthy subscriber list. In contrast, search engine rankings measure SEO performance, which is unrelated to the specific interactions or behaviors associated with email communications.