The present invention extends to methods, systems, computer program products, and data structures for decoupling an attachment from an electronic message that included the attachment. The method also comprises determining whether the sending system is in an unauthenticated mutually exclusive connection state. These data are then transmitted over special communications networks having very high coverage space but limited bandwidth. The charge reservoir is connected to the voltage supply to provide a current through the resistive element. A method of setting a packet transmission path includes setting N\u22121 routing regions including at least one node between a source node and a destination node based on a predetermined N number of hops, N denoting an integer greater than or equal to two, and determining a node in each of the routing regions as a relay node based on a channel gain. The methods include coating colored particles in a compressed carrier fluid on the substrate of the dye-donor element.