I have had Apple mail set to "Alerts" in Notification Centre (New Email creates an alert which needs to be dismissed). I had about 800 spam emails come in at once and now Notification Centre hogs the system resources trying to load all the alerts. It never manages to load them all before crashing and I have to force quit it before it reloads itself and starts all over again. I have tried deleting all the spam emails, setting "Mail alert style" to "None" and restarting the computer. Notification Centre is still trying to load all these alerts. Is there away to clear them or otherwise fix?