1) The document provides steps for writing a formal email, including using a clear descriptive subject line, greeting the recipient properly using their name or title, stating the purpose or topic clearly in the first paragraph, and ending politely with your name.
2) Key recommendations are to keep the subject line short but specific, greet the recipient formally using their full name or title if you don't know them well, indicate the topic in the first paragraph and any needed action in subsequent paragraphs, and end with a closing like "best regards" followed by your full name.
3) An example is provided of a reply email accepting an invitation to dinner, with a subject line stating the acceptance, greeting the recipient properly by name,