Abstract: A machine for processing envelopes includes a receiving assembly with a tray where envelopes are received and guided towards an envelope cutting assembly. A sensor determines the width of the envelope to align on of the two longitudinal cutting members. Another sensor detects the leading and railing edge of the envelope and with a circuit control the advancement of the envelope to cooperative positions that permit another cutter member to act transversally. The envelope is then passed to an unfolding assembly where the uppermost and lowermost sheets are loose and sandwich inbetween the contents. The uppermost sheet is pulled out to the display assembly that is hermetically closed. Subsequently, a transversally moving roller is used to lift the folds of the content, if any, and to affix the unfolded contents to protruding pins. The engagement with the protruding pins is slowly undone as the contents are pushed towards the display assembly.