QQ is blocked or blocked by others, and the message sent has no red exclamation mark, and the message sent is the same as that sent normally.

However, if it is blocked, the sent message will be displayed on its own side, but the other party cannot receive it; If you block each other and send messages to them yourself, they won't receive them.

Messages are sent with red exclamation marks for the following reasons:

1: Information transmission failed due to network delay or poor signal.

2: The other party is not in his friends list.

3: I am not in the other party's friend list.