The percentage of subscribers who remove themselves or are removed from an email list via unsubscribing, a spam complaint, or a hard bounce (collectively known as “churn”). Calculated by adding unsubscribes, hard bounces, and spam complaints for an email and dividing by the total list size. Industry-wide research generally finds annual churn rates in the 25 to 30 percent range.

The percentage of subscribers who remove themselves or are removed from an email list via unsubscribing, a spam complaint, or a hard bounce (collectively known as “churn”). Calculated by adding unsubscribes, hard bounces, and spam complaints for an email and dividing by the total list size. Industry-wide research generally finds annual churn rates in the 25 to 30 percent range.