We found the most important segment for email marketing, sourced with data. The 20% of your customers generating 80% of the returns The Answers, Straight Away: Engagement is the most important segment. Engaged subscribers outperform Non-Engaged subscribers on key marketing metrics like Open Rates and Click Rates. Control Group *Segmented by engagement Improvement Open Rates … More We found the most important segment for email marketing, sourced with data.