I find it quite annoying how I can't view the messages I have sent. Many times, I will have forgotten what I have said to somebody and can't reply properly. I sometimes am not sure if I succeeded in sending a telegram (forgot to look for the green bar, for example) and then I can't tell if it was sent. I risk claims of spam by sending it again. It would be very convenient for a "sent box" to be made, I think, if at all possible.
Hopefully this wasn't a waste of your time.
