configuration

Phil Mayers, Imperial College London NPS doesn't offer any conditional/branching features, or a way to bind a client/group to a set of policies, therefore you have to be careful to make sure your policies match appropriately. RADIUS clients Home service providers: you should create client entries for each NRPS under the "RADIUS Clients" section; be sure to set their "Friendly Name" to NRPS1, NRPS2, NRPS3 etc. so you can match them below.

Much of the required behaviour can be achieved by configuring your mail software. The details vary considerably between products and you should consult the product documentation or present your requirements very carefully to any contractors managing your mailers. It is unfortunate that in many cases the default behaviour (the way the software works as delivered or following a standard installation, upgrade or patch) is to openly relay, so you should check after making any changes.