An ink jet printer includes a transfer unit transferring a sheet of paper along a transfer path surface, a printer head ejecting ink towards the sheet of paper, and an air blowing unit blowing air towards ink ejected from the printer head. The sheet of paper may be a postal matter (e.g., letter, postcard, parcel) and the printer head may be used to print barcodes or the like on the sheet of paper for purposes of subsequent sorting and routing.