Would you open an e mail from a friend requesting a lunch date, a colleague offering a hot stock tip, or a company sending you an invoice for a gift?

• 当你收到一位朋友邀你共进午餐请你确定日期、一位同事主动向你提供一支炙手可热的股票信息、或者一家公司寄给你所购礼物的发票这样的电子邮件时，你会打开吗?