Aauto Quicker's private letter has been read. Is it light blue?

It can be judged according to whether the private message shows the read status. Usually the read status is displayed, indicating that the other party has checked.

Aauto Quicker's private message has reading function. If you don't want to receive private messages, you can click Close in Settings-Notification Settings-Private Message Notification. In this way, others can't send you private messages through a auto quickey, and a auto quickey's private messages won't show that they have been read.