There is provided a method and system for sorting mailpieces in which data objects that are relevant for the sorting of the mailpieces are processed, and a result of the processing of a data object in a first data processing system is transmitted to a second data processing system for further processing. An exemplary method comprises providing in the first and second data processing systems a definition list that contains associations between the data objects and an unambiguous identifier and in which attributes of the data objects are indicated, whereby the unambiguous identifier of the data object is contained in the result of the processing of the data object, and whereby the second data processing system ascertains the attributes of the data object on the basis of the definition list and carries out the further processing of the result of the processing of the data object in the first data processing system on the basis of the ascertained attributes.