Display sent, unread.

What you want to ask is "what is the reason for showing that it has been delivered and not showing that it has been read?" This question? The reason for this is the following：

1. Sometimes people may reply immediately after receiving the message, but if they don't check the message immediately, they won't show what they have read. You can try to wait for a while and see if the other party will reply.

Even if the message is interesting or important, the other party may not want to reply. This may be because the other person is busy or not interested in the topic.

3. Due to network or other technical problems, the other party may not be able to receive or view the message. In this case, you can try resending the mail or checking the network connection.