$1.$ Identify the key elements that make the first email a formal complaint email. Consider factors such as tone, language, structure, and the inclusion of relevant details.

$2.$ Evaluate the effectiveness of the second email in addressing the customer complaint. Assess whether the email is clear, concise, empathetic, and provides a satisfactory resolution or course of action.

$3.$ Analyze the structure of the third email, which is a business interview email. Identify the components that make it effective, including the subject line, introduction, purpose of the email, requested actions, and closing remarks.