An envelope has one wall with a stamp integrated in the wall. The wall has a zone of least resistance which surrounds the stamp for removing the stamp from the wall. The stamp has a first, inner face with adhesive and/or graphic signs. In another embodiment, a second, outer face is marked with graphic signs and the second face has prominent parts of deformation of the stamp, and the first face has concave parts in register with the prominent parts for facilitating separation of the stamp from the envelope.