Adding an automation. If we send, for example, 4 newsletters and a contact does not open any of them within a certain time period, they will be automatically unsubscribed from the list. If we send, for example, 4 newsletters and a given contact does not open any of them within a certain time, their status will change to unknown. We then send an email with information about their status because they do not open any emails from us and we do not want to spam them unnecessarily and they can re-subscribe if they wish. There will, of course, be a cta added with the possibility of re-subscribing.