I have a client that needs to restrict who their users send emails to and also restrict their ability to send attachments in MS Outlook. I have found solutions that work with MS Exchange to accomplish this, however, MS Exchange is not an option in this setting. The optimum solution would be a software add-in that will create some sort of white list that the users can send to and restrict them from sending attachments either at all -OR- to only those in their white list. The solution should also be one that is not easily circumvented by the user as the client needs to prevent the sharing of proprietary designs with competetion. The client can migrate to another email client other than Outlook if there is one that can accomplish this.