Cleaning your list helps remove contacts who never interact, which improves how email systems treat your messages. A simple way to do this is by sending a re-engagement email asking if they still want updates. If they click a button or reply, you know they are still interested. People who never respond can be paused instead of fully removed, giving them another chance later. You can also separate people who open sometimes from people who never open. This lets you keep potential customers without hurting your email performance. What method do you think works best to check if someone still wants to stay on a list?