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Deliverability Letter

List Churn

Also known as: Churn

The percentage of subscribers you lose from your email list in a set time period. It includes people who unsubscribe, mark you as spam, or are removed because their address no longer works.

List churn is a simple way to describe how fast people leave your email list. You start a month with a certain number of subscribers and some drop off by the end. That drop is your churn. Most teams track it every month or quarter so they can see trends over time.

Churn matters because it quietly eats into your growth. Even a small monthly rate can turn into a large yearly loss. A high churn rate often means your content, sending frequency, or audience targeting is off. Watching this number helps you spot problems early and protect revenue from email.

To keep list churn low, set clear expectations when people sign up and send useful, relevant messages. Check your reports often to find sources or segments that leave faster than others. If someone has not opened in a long time, send a simple re-engagement email and then remove them if they stay inactive.