In the final processing, variable possibilities for intelligent subsequent treatment are available. After the application of an address label, various control mechanisms ensure that only flawless envelopes are transported to the next conveyor belts. These controlling options range from an integrated weighing scales, to cameras or sensors that check the measurements of the filled and closed envelopes. In the last step of the post-processing, the finished envelope can be sorted or grouped according to agreed factors such as, for example, their weight, postal code, receiver’s branch, country of destination, or for special delivery by courier service. Optical aids like coloured markings, or dividing labels, make the collected groups on the conveyor belt recognizable.