smurf

Its also interesting for 3rd party contractor access. You should ensure a proper policy governing all "None School/LA" equipment plugged into the network. Also, AUP's to ensure that any disaplinary will stand up. Its important that the AUP/Security Policy is also given to the users in order to enforce them. If adequate training isn't provided then it will not stand up in court or appeals.

With Exchange 2007 and the introduction of the Hub Transport, all e-mail (even internal e-mail within the same server) goes through this Hub Transport, this means you can setup policies to acheive this goal.