How do you open the mailbox without knowing password?

Opening a mailbox without knowing the passWord is generally not possible due to security measures designed to protect user accounts. If you've forgotten your passWord, the appropriate method is to use the "Forgot PassWord" feature provided by the email service, which typically allows you to reset your passWord via a recovery email or phone number. If you're unable to reset it, you may need to contact the email provider's customer support for further assistance. Attempting to bypass security measures is not recommended and may be illegal.