So this would work much like battle dawn.. you are able to send and receive messages in a tab... and it'll go green if you get a new message.. (super mech color;))
Now I know some of you are thinking.. just use the forums and skype.. and yes we can use that and it's great... but the game itself could use some social help.. just being able to shoot someone a message and talking or asking if someone would like to private battle would be a huge boost to the game.. The social part of the game is a bit lacking and this would be a simple way to help the game:)

I do not see how this is much different than the other messaging ideas (which drastically need a bump), but I like it!