Running periodic pruning operations will help you to keep your subscriber list in top shape. Let's face it, if a subscriber hasn't opened or clicked through your last few email, there's a good chance they're lost for good. Plus pruning your list will help you stay at your current Drip subscription level for longer—meaning you're keeping your costs down.
Go to Subscribers > Pruning Operations > click New Pruning Operation.
Select either "Count-Based" or "Time-Based" when setting up your pruning operation.
Selecting "Count-Base" will return all subscribers that have not opened or clicked any of their last "x" number of emails. Choosing "Time-Base" returns any subscribers that haven't opened or clicked an email in the last "x" number of days.
You can add additional filters to the segment in order to get hyper dialed in with the right subscribers.
For example, the following example will remove any subscriber from your account that has not opened or clicked any emails within the last 30 days. However, we've added a bit more segmentation so that this operation will only remove subscribers if they also have a lead score that is less than twenty.
Once you're ready to run your segment, click Prune Subscribers.
Note: Pruning operations cannot be reversed. Be sure to double check your segment before completing the operations.