Some messages not delivered Mac
For the past month, some messages in Messanger are sent and some not. This only happens with a few people and it is not because I am sending videos or photos, it can be anything. I don't have a problem with my iPhone, only my Mac. I have signed out, turned Mac off then on and signed in again but it still is not fixed. I keep on top of all updates. Also, I have checked the recipient's settings and they do not have any problems with other peoples messages coming in.
Any ideas please?
MacBook Pro with Retina display