How can I know the verification code of QQ mailbox?

After you complain, QQ will send an email to your mailbox and open it to find it! After the appeal is successful, the mailbox will be automatically set as the contact mailbox in the second-generation password-protected data. I think when you complain, you will be asked to fill in a contact email, and this email verification code will be sent to your contact email. You can have a look. The above are suggestions, you can try!