If you regularly use PRIVATE MESSAGES (PM) messaging on this forum, like I do, then you must ensure you regularly delete some of your 'SENT ITEMS' as well as deleting some messages from your INBOX. Notifications doesn't give you very much space. If you don't delete SENT ITEMS on a regular basis means anyone attempting to send you a message they will have it bounced back. I have sent a couple lately but they are not getting through as the recipient as too many SENT ITEMS in his box therefore the deletion of some SENT ITEMS will resolve it. Hope this helps