How to use 139 mailbox to send text messages without being detected as spam?

Dear, in order to create a green network communication environment, 139 mailbox has an automatic monitoring and filtering spam system. It will judge the nature of the text message based on the frequency of user sending and the content of the text message before sending it. Please understand. If a text message is detected as spam when sending, it is recommended that you adjust the content or words of the text message and try again, and pay attention to controlling the frequency of sending text messages. Do not send a large number of text messages with the same content or containing advertising in a short period of time. Hope this helps!