Definition
Email list engagement distribution shows the breakdown of subscribers by their recent engagement level. A typical distribution follows a power law curve where a small proportion of subscribers account for the majority of opens and clicks, while a larger proportion shows low or no engagement. Understanding this distribution helps set realistic performance expectations, identify list quality issues, and determine appropriate sending strategies for each engagement tier.
Common Distribution Pattern
A healthy commercial list often shows approximately 20-30% active subscribers (engaged in the last 30 days), 15-20% slipping (last engaged 30-90 days ago), 15-20% at-risk (90-180 days), and 30-40% dormant (no engagement in 180+ days). The exact distribution varies significantly by industry, acquisition method, list age, and sending frequency.
Best Practices
- Measure engagement distribution monthly and track how it shifts over time
- Compare your distribution against industry benchmarks for your sector
- Investigate when the dormant segment grows faster than the active segment
- Use distribution data to determine re-engagement strategy and sunset thresholds
- Recognise that improving distribution — moving subscribers from dormant to active tiers — is a primary list health objective
Related Glossary Terms
Abandoned Cart Email
An abandoned cart email is an automated message sent to customers who added items to their online shopping cart but left without completing the purchase. It is one of the highest-converting email types in ecommerce.
ARPU (Average Revenue Per User)
ARPU (Average Revenue Per User) is a metric that measures the average revenue generated per email subscriber over a specific period, used to evaluate list value and campaign effectiveness.
Attention Rate
Attention rate is the percentage of email opens that last longer than 5 seconds, distinguishing genuine reads from passive opens, preview-pane views, or Apple MPP auto-loads.
Bounce Rate Threshold
A bounce rate threshold is the percentage of hard or soft bounces at which email platforms and ISPs begin to penalise sender reputation, typically around 2-5%.
Bounce Rate
Email bounce rate is the percentage of emails that were rejected by the receiving server before reaching the recipient. It is a key indicator of list health and data quality.
Campaign Lifted Revenue
Campaign lifted revenue is the additional revenue generated by an email campaign beyond what would have occurred without it, measured via a holdout group or statistical lift analysis.