Hello, hello, is your signature a signature? That is, it is automatically added to the bottom of the email after writing? Excuse me, where did you write it with QQ mailbox? If you are in the browser web interface, click Settings, and then set the personalized signature to "Do not use signature" in the General tab.

In the mobile version of QQ email, click Settings in the menu in the upper right corner, click your email account to enter, click personalized signature, delete the content, and then return.