Hello, you can use the personalized signature of QQ mailbox to achieve your purpose. Click Settings in the upper left corner of the email web version, click Personalized Signature in the "General" tab, click Add Personalized Signature, enter the corresponding text and layout, or even use pictures on the Internet.

Then you find Account Management in the Account tab, click the settings button to the right of the account you usually send credit to, select the account to use your own nickname and signature, and select the signature you set earlier. This signature will automatically be included when sending letters in the future.