A portable, manually actuated mail bar code stamp including a hand-held, portable housing and an adjustable bar code printing assembly situated within the housing. The printing assembly is adapted to allow the printing of indicia on an envelope. The indicia includes a plurality of linear protrusions that are spaced and parallel with respect to each other. The linear protrusions have a first length and a second length thereby representing a coded equivalent of a zip code and routing number for facilitating the delivery of mail.