Why is the mailbox 163 returned?

I have encountered this situation, which has just been solved recently, mainly for two reasons:

1, spam, simulate yourself as a "system bounce" to attract you to click, in order to achieve the goal.

After blacklisting that number, it will not be received again;

2. It's really a "system bounce", mainly because you turned on the automatic reply function, but now many sent emails have not been received, resulting in your reply email being returned. You have to turn off the automatic reply function in the "Settings" of your mailbox, so that you won't receive it again.

Extended data

163 mailbox is a free mailbox launched by Netease in 2000.

163 mailbox has huge storage space, supports oversized attachments, and can send or receive multiple attachments at one time. It is committed to providing users with safe, stable, fast and convenient e-mail services. With more than 230 million users, it is the most used Chinese mailbox in the world.