It's what I tought but just wanted to confirm. So those in Outbox mean that they haven't beed read or maybe the user haven't log in since it was sent?Outbox are messages that are out and not received and sent messages are messages that have been sent and also been received.
At least this is what I think.
Sent and it's in my Outbox. Before reading it, let me know so we can get precise result.Try it out, send me a message and I will wait a day until I read it.