分类给定的邮件，将其标记为垃圾邮件或非垃圾邮件。
邮件标题: “50% DISCOUNT ON ALL ITEMS – LIMITED TIME OFFER”
邮件内容: Dear Valued Customer, Don't miss out on our limited time offer! Get a 50% discount on all items when you use the code LTO50 at checkout. Buy now and save big! Best regards, ABC Inc.
垃圾邮件。