Sanebox is an email streamlining service that analyzes your past behavior (which emails you open, which you respond to, how quickly, how often, etc.) and determines the importance of your incoming emails through their headers. Your most important emails are prioritized, and less important emails are pulled into a separate folder and summarized in a digest. It also includes a snooze function for non-urgent emails, unsubscribing with one-click, reminders when people don't reply to you and more.