I did happen to read your original post... just didn't get a chance to reply to it.
For what it is worth - our house is pretty well in order. Understandably people are frustrated at times - however - the manner of which your original post was worded on here was quite inappropriate and at best - rude. Regardless...
You can find the answer to your question by simply *READING* the rules forum. viewforum.php?f=28
While reading you will discover that there is a topic regarding how PM's work...viewtopic.php?f=28&t=69474
When you compose a private message on here, the message will sit in your Outbox until such time that the person you sent it to actually reads it. When they read it, it automatically moves to your Sent box on the system. A copy in the database is made, and both you and the original poster can read it.
That has been there since 2007.
Please let me know if we have adequately addressed your question or if I can provide any further information.