Why does the short message I received show QQ mailbox?

Are you using an Apple phone? If you and the other party both use Apple phones, then you will use the imessage software in Apple phones to send messages by default. This software sends messages like WeChat and charges for browsing. The qq email number on the message you received is actually the ID number of your iphone.

1. The mail was rejected or put in the trash because of anti-spam; ?

2. The other server didn't send it because of network and other reasons;

In the first case, you can set a white list to ensure that you can solve the problem of not receiving emails. In the second case, the recipient can't solve it, so you need to try to contact the other mail service provider. If you need help, you can contact Tencent Customer Service Center.