You know the feeling: you open your email and the unread counter just says “999+” because the program can’t count any higher. You scroll—and scroll—and scroll—only to see repeat subject lines from people who’ve pinged you three times because you never answered the first one. Maybe you’ve just come back from holiday, maybe a life-event set the world texting and emailing you, or maybe you simply haven’t wrangled your inbox in a while. Whatever the cause, you’ve got a big, sick-making inbox on your hands.