分类电子邮件为垃圾邮件或非垃圾邮件。
邮件正文：{"Hi there, we noticed you haven't logged in lately", "Earn quick money now with our new investment scheme!", "Your order has shipped", "Discount code for your next purchase!"}
垃圾邮件：{"Earn quick money now with our new investment scheme!"}
非垃圾邮件：{"Hi there, we noticed you haven't logged in lately", "Your order has shipped", "Discount code for your next purchase!"}