You can enter the menu in the upper-right corner of the Ali Wangwang, select system settings, and in the pop-up page, select "Security Settings"--prevent harassment and, if necessary, choose ' do not receive information from strangers '. Strangers refer to users who have never been contacted, and if they are sellers, use this function with caution.
You can also select the "start to prevent harassment", the right Point "add", enter the information you do not want to receive the keywords, such as "brush reputation" and so on. After the operation is completed, press "Apply" and press "OK", and you will no longer receive the information containing these keywords.
Please look at the following figure: