Hello, the displayed email address is invalid because the format of the email address you filled in is wrong. The correct address format is username @ email domain name. For example, the address format of QQ e-mail is user name @ qq.com The user name in front can be digital account number, English account number or mobile phone account number, and it must be separated by an @ symbol in the middle, and there can be no redundant symbol before and after the @ symbol, followed by the email domain name. The separator in the email domain name is below, not in the middle, and it must also be a half-width symbol.