What about a nailed message?

Nail many communication functions, such as chatting, nailing email, announcement, ding and so on. , you can view the read and unread, and the functions are default, so you don't need to open them separately.

If the other party opens the chat interface and sees your message, it will be in a read state and does not need to stay for too long. If you don't see your mail, it is unread.

The mailing list will display read and unread status.