Not credible. China Post has no door-to-door credit card service. If someone claims to be a postal worker, he needs to provide personal identity card information, and first verify the identity of the cardholder. Each cardholder has his own work number. Before submitting personal information, you should call Huaxia Bank customer service to verify the cardholder's identity information, and then submit the information after confirmation, so as to avoid being defrauded of personal information by other fraudsters. Therefore, Huaxia Bank can't be trusted to handle credit cards by post.