You can create a policy to determine which IM networks that members of a particular group can access. You can also enable or disable file transfers and extended features for each IM network to which you allow access. Most IM clients provide extended features that allow IM users to communicate with each other by a means other than IM, such as audio or video. Extended features also include such features as application sharing and games. If you do not want your IM users to use these features, you can disable them. You can also send a notification to an IM user who attempts to use an extended feature that is disabled.
Symantec Messaging Gateway is installed with a default Network Access Control policy that allows access to the following public IM networks:
You can configure Symantec Messaging Gateway to block access to an IM network that you do not support. When you block access to an IM network, each IM filtering Scanner is prevented from connecting to that network's public IM network servers. IM users that attempt to sign on to a blocked IM network are notified by the IM client that the connection attempt failed.
To create a Network Access Control policy
Under Actions, check If a blocked network feature is detected send the following notification if you want to send a notification to an IM user who is blocked from sending a file or using an extended feature.