I consider more than three paragraphs and more than two sentences per paragraph a "writing smell." It's relatively easy now, especially when I realized my predilection for verbosity was actually a symptom of my own insecurity, emotionalism, and indecisiveness.

I try to limit my emails to one, clear, strong point—usually just factual statements—in the active voice, eschewing adverbs as much as possible. The emails almost write themselves now, because there isn't much choice on what to write anymore.