Of course, you're already making the assumption that the example was an imperative sentence. It could just as easily have been the answer to the question "what do you think Fred should do with that email?"

(I don't think I really have a point, other than that natural language, like Perl, is highly context-sensitive. Similar ambiguities arise in languages other than English, even those such as Japanese that are sometimes claimed to be logical and consistent by people who don't know much about them.)