1. A method for selectively allowing access to a plurality of resources in a network, the method comprising: receiving a request originated from a user of a multi-user system to transmit a message via the multi-user system over the network to one of the plurality of resources, wherein each of the plurality of resources has been assigned to one of a plurality of security zones based on a level of security sensitivity of the resource; identifying a one of the plurality of security zones that is associated with the one of the plurality of resources; determining if the user of the multi-user system is authorized access to the identified one of the plurality of security zones; and forwarding the message from the multi-user system over the network only if it is determined that the user is authorized access to the identified one of the plurality of security zones.