I agree that this is a needed feature. The current options are not sufficient. The ability to mark a contact as Inactive rather than opting them out or deleting the record is standard in most CRMs. We need a way to preserve the history when a contact leaves a company, with a tag that can easily be filtered out for communications. Ideally, users would also not be charged for Inactive contacts. HubSpot could prevent users from taking advantage of that by not allowing emails to be sent to inactive contacts until they were made active again.