Is it a scam to receive a mail notice without sending an email?

There is a short message. Is there a courier number for the short message content? If there is no express bill number, it should be fake. I used to get calls from the postal service saying that there were drugs in the package and so on. . This kind is a liar. You should call EMS more often to ask, and then check the waybill number online to see if it is the same as what the postal service said.