What's wrong with Apple's mobile phone setting for Lunar New Year without ssl connection?

Before adding an account, if your iphone uses a mobile network,

Please confirm that your mobile network is connected to cmnet and cmwap.

This method cannot send and receive mail normally. After saving the account information settings,

The system will automatically verify the account information, and when prompted, it will prompt: "Cannot make.

Connect with SSL Do you want to set up an account without SSL? Please select "No",