Email List Source Analysis

Definition

Email list source analysis evaluates how subscribers from different acquisition channels perform over time. Raw acquisition volume tells only part of the story — a channel that delivers many subscribers but low engagement or high churn may be less valuable than a smaller channel that produces loyal, engaged subscribers. Source analysis tracks metrics per channel including cost per subscriber, activation rate, 30-day and 90-day engagement, conversion rate, subscriber lifetime value, and churn rate.

Metrics to Track per Source

• Cost per acquired subscriber
• Activation rate (percentage who engage within first 30 days)
• 90-day open and click rates
• Conversion rate and revenue per subscriber
• Churn rate at 30, 90 and 180 days
• Subscriber lifetime value by source

Best Practices

• Tag every new subscriber with their acquisition source at the point of capture
• Build a cohort analysis comparing source performance at 30, 90 and 180 days
• Rebalance acquisition investment toward sources with the best combined metrics, not just the lowest cost
• Monitor source quality trends over time — a channel that performs well today may degrade as audience pools are exhausted
• Use source analysis to inform creative strategy, since subscribers from different channels may respond to different messaging