Hello,

QQ mailbox has a whitelist function. If the mails filtered by the server are added to the whitelist, you can receive them. First, you must know the mailbox of the postal credit card bill notification mail. address (you can call the store to consult customer service), then log in to mail.qq.com through the browser, click Settings---Anti-Spam---Add to the whitelist, as shown in the picture:

I hope to You helped!