(57) An automatic mail-processing device with full functions, which can be operated by only one postal clerk, and wherein by means of a microprocessor, all kinds of delivery types and additional service types such as registered special, insured, attested and express types of various individual letters or bulk mailings are included and functions of automatical weighing, postage calculation, charging, postage stamping (or postage note stamping), postage receipt printing, register receipt printing, and regular daily, weekly or monthly income list printing are performed whereby a great amount of labor and time are saved, and the mail-processing operation is carried out highly efficiently.