Proofpoint provides email security services to a multitude of corporations. Specifically, Proofpoint filters out dangerous emails before delivery. Some emails could be suspicious, but Proofpoint must deliver them in case they are false alarms. Unfortunately, there is currently no way for recipients to determine which emails Proofpoint suspects. These emails could be dangerous and harm recipients’ computers when read. The Proofpoint clinic team built an Outlook plugin that distinguishes potentially threatening emails to inform users’ reading decisions.