A method for sorting postal objects comprising the steps of: - treating sets of grouped postal objects by means of a sorter for generating singulated postal objects, i.e., each one physically separated from the others; and - sorting the singulated postal objects in a sorting device that is configured to direct each postal object towards a respective selected outlet from among a number n of selectable outlets of the sorting device, characterized in that it comprises the steps of: - performing an initial first sorting step in the sorting device, accumulating, within an i-th selected outlet, pre-sorted postal objects belonging to K subgroups having homogeneous delivery points, i.e., consecutive according to the order of delivery; - carrying out an intermediate step of re-processing of the previously pre-sorted postal objects, whereby the postal objects withdrawn from the outlets of the sorting device are fed to a magnifier device and are treated for forming lots of overlapping postal objects; each lot comprising the postal objects belonging to a respective homogeneous subgroup ordered according to successive delivery points; and performing a second final step of sorting the lots, which provides for sending of the postal objects having corresponding positions within each lot to a one and the same outlet of the sorting device; the objects are accumulated in the outlet according to successive delivery points and then sequenced, wherein said magnifier device operates said intermediate step in a pipeline mode so that each lot pre sorted in the initial step and withdrawn from an outlet is forwarded for the final step as soon a next lot withdrawn from a different outlet enters the intermediate step.. - treating sets of grouped postal objects by means of a sorter for generating singulated postal objects, i.e., each one physically separated from the others; and - sorting the singulated postal objects in a sorting device that is configured to direct each postal object towards a respective selected outlet from among a number n of selectable outlets of the sorting device, characterized in that it comprises the steps of: - performing an initial first sorting step in the sorting device, accumulating, within an i-th selected outlet, pre-sorted postal objects belonging to K subgroups having homogeneous delivery points, i.e., consecutive according to the order of delivery; - carrying out an intermediate step of re-processing of the previously pre-sorted postal objects, whereby the postal objects withdrawn from the outlets of the sorting device are fed to a magnifier device and are treated for forming lots of overlapping postal objects; each lot comprising the postal objects belonging to a respective homogeneous subgroup ordered according to successive delivery points; and performing a second final step of sorting the lots, which provides for sending of the postal objects having corresponding positions within each lot to a one and the same outlet of the sorting device; the objects are accumulated in the outlet according to successive delivery points and then sequenced, wherein said magnifier device operates said intermediate step in a pipeline mode so that each lot pre sorted in the initial step and withdrawn from an outlet is forwarded for the final step as soon a next lot withdrawn from a different outlet enters the intermediate step..