The present invention is an envelope sheet capable of being automatically printed and formed into a standard business envelope using a high-speed separate sheet printer in line with high-speed separate sheet folding and pressure sealing equipment. The present envelope sheet comprises a front panel connected to a back panel along a bottom fold line, to a closing flap along a top fold line, to a left-side flap along a left-side fold line and to a right-side flat along a right-side fold line. The front panel, back panel, closing flap and both side flaps each have an upper surface and a lower surface. The back panel is adhered to the left-side and right-side flaps with a latent adhesive sandwiched therebetween. The present invention also includes a method and apparatus for automatically printing and forming an envelope from the present envelope sheet, as well as automatically stuffing the envelope while it is being formed.