For those that might not know "If you are browsing the forums when you receive a new private message, the system can pop-up a notification box informing you of the new message."
Go to settings then General settings to turn pop up notifications on.
Thanks for that.
Does it still show a new message if your box is full?
If you kept on sending only him pms, only to be knocked back with a 'Box Full' message, you would have to have the skin of a rhino not to get the message which was never sent.....