A mailbox can be registered in CCB's credit card information to receive CCB's electronic bills. If you need to change this email address, there are many ways to change it. It is more convenient to change through online banking. After logging in to online banking, you can modify your email address through "Credit Card-Credit Card Management-Personal Data Modification-Address Information Modification". You can also call the customer service hotline to make changes, but because there will be letters and numbers in the mailbox, it is easy to make mistakes directly, so it is most convenient to make changes through online banking.