Abstract: In a mail processing machine comprising a reception plate for receiving, in the form of a stack of items, the mail items to be printed, a jogging means for jogging this stack of items against a reference wall, a selection means for extracting the mail items to be printed from this stack of items one by one, and a printing means for printing a postal stamp on the selected mail item, an anti-skew device is provided, comprising a plurality of pivoting levers which are each positioned at a defined distance from the reference wall and a first end of which extends through an orifice made in the reception plate, in order to form, above the plate, a removable lateral obstacle for the mail items. These defined distances each correspond to a width of envelope of different format.

Abstract: In a mail processing machine comprising a reception plate for receiving, in the form of a stack of items, the mail items to be printed, a jogging means for jogging this stack of items against a reference wall, a selection means for extracting the mail items to be printed from this stack of items one by one, -and a printing means for printing a postal stamp on the selected mail item, an anti-skew device is provided, comprising a plurality of pivoting levers which are each positioned at a defined distance from the reference wall and a first end of which extends through an orifice made in the reception plate, in order to form, above the plate, a removable lateral obstacle for the mail items. These defined distances each correspond to a width of envelope of different format.