Hello. When you apply for a credit card, you need to fill in your email account. If you don't have an email address yet. You can download the mailbox master produced by Netease. After downloading, the mailbox owner can register with his mobile phone number. You can also register with pinyin letters. After the registration is successful, the mailbox can send and receive mail. You can also use an email account to register applications. The registration number is your email account.