In a mail processing system that delivers articles to delivery locations a first transport vehicle at a first loading point is loaded with a first article, and guided along a first delivery path to a first delivery location. A second transport vehicle at a second loading point is loaded with a second article, and guided along a second delivery path to a second delivery location. Depending on a determination of whether the first and second transport vehicles deliver the first and second articles to the respective first and second delivery locations, the method returns an empty transport vehicle to the nearest one of the loading points and bypasses one of the first and second loading points for a still loaded transport vehicle. This allows to minimize the number of transport vehicles within the system.