One of Mail’s most powerful features is not immediately obvious, and rarely used to it’s full potential. This feature is called “rules” and can be found hidden within the application’s preferences. Rules basically allow you to tell Mail what to do when certain things happen – moving email between folders, adding colours, or automatically sending a response.
Here, I will explain what rules are capable of, and how do use them to make the most of your email client. The article will also outline a few novel examples, including the ability to send your computer to sleep via a simple email.