private messages

if a private message isnt read after so many days is it just deleted? i had a message that i sent over a week ago that was in my outbox but just dissappeared and never appeared in my sentbox like all my other.
Conquer Club, a free online multiplayer variation of a popular world domination board game.
http://rzmhprwww.conquerclub.com/forum/
http://rzmhprwww.conquerclub.com/forum/viewtopic.php?f=6&t=2167