Abstract: Method of sorting postal objects in which a postal sorting machine has a first input and at least one second input and a plurality of outputs communicating with the inputs via a sorter device. The method comprises the steps of: supplying first and second streams of postal objects to the first and second inputs, directing the postal objects to all the outputs; withdrawing from at least some of the outputs groups of postal objects previously directed to respective outputs forming two collections of groups of postal objects; and operating in a transport mode which each postal object supplied to the first input is directed only towards a first subset of the outputs and each postal object supplied to the second input is directed only towards the second subset of the said output. During the said transport mode the groups of postal objects belonging to a respective collection are supplied respectively to the first and second input.