ItemAdd Event

There is one event that is fired when a new item is arrived in the folder. It's a folder event. But, there is a problem with that event: ItemAdd may not fire if many items arrive in the folder at once.
A workaround would be to process the Item that ItemAdd passes as an argument and mark that item as processed (you can use Mileage property for that purpose). Then process any other unmarked items in the folder.