If a message is sent on messenger and it is a circle with a tick that is not shaded then I understand it is not received.
There are various reasons for this such as person logged out of Facebook etc.
It also mentions that the person could be ignoring you. Whilst that's a possibility I don't understand how if it's not been received by them how can they be ignoring it. Surely if they were ignoring you wouldn't it just go to a shaded circle and tick?
Anyone can help me with this?