With these transports installed, is it possible to restrict certain users from accessing the transport limiting them to internal messaging only?
You can implement a PacketInterceptor that will reject any attempt of those users to subscribe with these gateways. Let us know if you need any help.
For the time being, I have htaccess’'ed the /webreg (from the pyMSN site) registration page on the jabber server block the registration of external gateways without proper authentication. I am interested in the packet interceptor though. If you could point me to some further information it would be appreciated.