An e-mail firewall applies policies to messages between a first site and a plurality of second sites in accordance with administrator selectable policies. The heating furnace for testing middle and long span structures includes a partition unit formed of a refractory material and partitioning a heating space in a main body to block transfer of heat generated from one space to the other space. The nodes access files on one or more data storage devices over a network. The logic circuit may be configured to generate an output representing a volume of packet traffic in response to the plurality of first values and the second value. Once identified, the method uses a power management scheme to remove the sector prone to failure from further use by the memory system and displays to a user the details of the action taken.