PURPOSE: To prevent printed data on a confidential part of correspondence from being transferred to its opposite part by providing a film-coated layer of an adhesive composition on the confidential part and specifying the permeability.

CONSTITUTION: Separable confidential parts 6a, 6b of correspondence including a coated paint of an adhesive composition is provided on the rear side of a base sheet 10. A top sheet piece 2 with a printed address information section 5 and a bottom sheet piece 4 are attached together under pressure after folding a piece of pressure- attaching sheet for ink jet in such a manner that the top sheet piece 2 is positioned on the front surface and the confidential parts 6a, 6b are stacked on each other. The adhesive composition is dispersed in a water containing 15 pts.wt. of amorphous silica with a typical grain size of 3μm or less dissolved in an acrylic dispersant. In addition, 15 pts.wt. of the solid part of a liquid obtained by thermally melting polyvinyl alcohol dispersed in water and a filler-dispersed solution are mixed. Further, 100 pts.wt. of the solid part of a natural rubber latex and 1.5 pts.wt. of waterproofness imparting agent are added to the mixture to obtain the paint which is used for the formation of a film-coated layer. It is possible to prevent the confidential part of correspondence from being transferred to its opposite part by setting the permeability (JIS-P8117) at 10sec or more.