A sorting system for sorting flat objects, particularly mail items, and a method for sorting such objects. The sorting system has a discharge device and an arrangement having at least two output devices. The output devices are arranged one behind the other as viewed in a longitudinal axis. The discharge device is designed to discharge each flat object to be sorted into one of the output devices in each case in such a way that the objects discharged into the same output device form a stack. Each output device has a bottom. The bottom of each output device rises with respect to the horizontal as viewed in a rising direction. An edge appears between the bottoms of two adjacent output devices. The edge slopes downward vertically or aslant as viewed in the rising direction.