That's what I've noticed - the message stops being white in the sent box once the recipient has read it. Same with messages you receive, they're white
but once you've read them they'll be white no longer.
eta: If I may share my terrible photoshopping skills...
My current outbox, all of which have been read except for that lonely white one.
edit on 10 6 2016 by kaelci because: (no reason given)
I am not sure if they changed it or not, but if you click on a white message in your sent messages, it will not be white anymore for the person you
sent it to, and they will not see that they have a received message in their inbox.
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