Abstract: Methods and systems for automatically applying additional postage to mail items within presorted mail. The method of this invention for acting upon presorted mail, in order to adjust postage applied to the presorted mail, includes the step of determining the correctness of the postage applied to individual items within the presorted mail. If the postage applied is incorrect, the method of this invention also includes the following steps, performed while the individual items are being transported through a mailing apparatus: a) weighing separately the individual items in order to determine the weight of each individual item; b) determining an additional amount of postage to be applied to the individual items, in order to correct the postage for the individual items; and, c) applying the additional amount of postage to the individual items. Systems that implement the method of this invention are also disclosed.