Subscriber Churn
Subscriber churn is the rate at which subscribers leave your email list through unsubscribes, bounces, or spam complaints.
What Is Subscriber Churn?
Churn is calculated as (unsubscribes + bounces + complaints) ÷ total subscribers over a given period. A healthy monthly churn rate for newsletters is 0.5-2%. Higher churn means you need to acquire more subscribers just to maintain your list size, creating a 'leaky bucket' problem. Churn happens for many reasons: content fatigue, changed interests, too many emails, irrelevant content, or simply forgetting why they subscribed. Understanding the reasons behind churn helps you address the root causes. Some churn is healthy — subscribers who are no longer interested are better off unsubscribing than staying and dragging down your engagement metrics.
Why It Matters for Newsletters
Churn directly impacts your list growth rate and the sustainability of your newsletter. If you're churning 5% monthly, you need to add 5% new subscribers just to stay flat. Understanding and reducing churn is often more cost-effective than increasing acquisition. It's easier to keep a subscriber than to find a new one.
Best Practices
- Monitor churn rate monthly and investigate any spikes
- Survey unsubscribers to understand their reasons
- Address common churn causes: frequency issues, content relevance, inbox fatigue
- Implement re-engagement campaigns to save at-risk subscribers
- Distinguish between healthy churn (natural turnover) and problematic churn (content/delivery issues)
How Aldus Handles This
Aldus tracks subscriber churn and uses AI-powered re-engagement campaigns to intervene before subscribers leave. The platform identifies at-risk subscribers based on declining engagement and sends personalised win-back messages.