Harvard Business Review in 1985 published study-findings regarding the most effective way to communicate. The article concluded that the most effective way to communicate was when we talked face-to-face. Perhaps that is why Jesus taught us to "go" to the other person when we have a conflict to reconcile. Could it be what Jesus taught really works? Apparently, Harvard Business Review would think so.
Oh, write a letter? Only if it is an invitation to talk face-to-face.