Would it be too much trouble to have a small text message in upper right hand corner of monitor that a mission was posted, so that everyone in the arena would know with out having to keeping putting it in the text buffer which is supposed to be for chat?
To add my 2 cents: Put it in the text buffer instead of the upper right hand corner of the screen. I know the text buffer is for chat, but I wouldn't want more clutter on my screen. Also, make it an option instead of automatic for all posted missions. I might be posting a mission just for a small group, and not want it broadcast.
Of course, for your missions, I always want to know when they are posted. I love those missions. My timing has been off, and I've missed them the last couple of weeks.