Log in to the QR code in QQ mailbox, and then you can log in to the mailbox safely with QQ scanning. If the email in the mailbox has a QR code, don't scan it easily. Please confirm whether the sender's address is a known contact. Don't scan the QR code of strangers' emails or the links in emails. It may be a phishing website, because a link will jump after scanning the QR code.

Function of QR code: Any information can be converted into QR code by a specific coding algorithm. A common complex information (such as a very long website, some encrypted strings, or a complex courier number) is very cumbersome and makes a big mistake if it is entered manually. However, if the text is converted into a two-dimensional code, it can be easily recognized with a scanning gun or camera, and it is almost impossible to make mistakes, which greatly improves the access efficiency.