You would like to know how to optimize your emailings, but you don't know where to start? Emailing is a more complicated medium than it seems, but it doesn't take much to optimize it. We propose to establish a diagnosis of your newsletter. Not a long and boring document, no, a list of strong points to keep (because there are always some) and weak points to optimize your practices. These points are presented in order of importance to help you visualize your priorities.