Method of processing mailpieces, the method including combining the batches of mailpieces

A method of processing mailpieces for sorting mailpieces into sequence in a postal sorting machine depending on delivery points of delivery rounds, in which method the mailpieces are grouped together into various batches (L1-L5) associated with one or more delivery rounds and are sorted in the postal sorting machine by batch as a function of various sorting plans associated respectively with the various batches of mailpieces, each sorting plan associated with a batch of mailpieces defining an ordered list of delivery points of one or more delivery rounds, which method is characterized by the following steps:

• assessing the mailpieces before the machine sorting to detect those that will under-use the sorting capacities of the postal sorting machine, i.e. those for which the mailpieces will fill the sorting outlets of the postal sorting machine to an insufficient extent;
• aggregating the batches of mailpieces detected as under-using the machine capacity so as to constitute one or more aggregated batches of mailpieces;
• computing in the postal sorting machine, for each aggregated batch of mailpieces, an associated sorting plan resulting from the aggregating;
• and
• feeding each aggregated batch of mailpieces into the postal sorting machine and controlling the machine in such manner as to sort the mailpieces as a function of the sorting plan computed for said aggregated batch of mailpieces.