139 strange SMS notification.

Hello, first of all, make sure that you are logging in when you receive the short message, because the ownership of IP address is dynamic. Maybe you originally logged into a city in China, and the system recognized it as the United States. If that's the case, don't worry. You can call 10086 for feedback. In addition, you can check the recent login records by yourself on the webpage of 139 mailbox, and click "Settings-Login Query". I hope it helps you!