A method for controlling the printing in a mail processing device proceeds on the basis of a word-by-word storage of binary pixel data in the pixel memory with a predefined number of successive data words forming a data string, and a predefined number of data strings representing at least one print image. This facilitates a modification of variable binary pixel data in the pixel memory when the sequence of the binary pixel data in at least a part of the respective data string coincides with the sequence of pixels in at least one corresponding print image column that is provided for the printing. After a word-by-word transmission of binary pixel data of a data string from the pixel memory by direct memory access (DMA), an intermediate storage of the data string ensues in a pixel data editing unit before a pixel data editing is implemented during the printing with an ink jet printhead. The ink jet printhead is supplied with selected binary pixel data grouped in a predefined sequence that is dependent on the type of the ink jet printhead that is employed.