PMs don't disappear when person logs off

[Antago]

Person should go to an "offline" list on the playerlist if their PM is still unread. Similarly, the PM could be automatically saved to the person's computer so that next time they log on, if they did not read it, the PM would show up on the playerlist under "missed" PMs or something, giving the person the date and time it was sent.

Lots of messages go unread because of being kicked offline and things like that. This should not occur.