The middle child on your email subscriber list needs some attention.

Those high-achieving oldest children—email subscribers who are active, engaged and likely to purchase—garner a lot of praise and interest. And a good amount of time is spent worrying about those rebellious younger children—those subscribers who have officially opted out.

But what about those who are technically subscribed to your emails, but are inactive and uninterested? These subscribers quickly delete your emails without reading them, but haven’t taken the effort to opt-out. It’s time to think about those middle children, or the “emotionally unsubscribed” as marketing blogger Joanna Lawson Matthew calls them.