Multi server Instant Messenger Communication covers the most advanced features of the IceWarp Server's Instant Messenging.
Suppose, that we have two IceWarp Servers connected to the Internet:
If you want to communicate with users from other servers, you do not need to connect to these servers directly. You can connect to the any server from your own IM account.
When you add a new user to your roster from a remote server IceWarp Server Instant Messenger will recognize it and will connect to this other server automatically.
However to achieve this functionality you have to make sure any of the following is set properly:
Anonymous Server to Server Communication
To enable anonymous communication just check the option with the same name. This scenario assumes the domain/node name is the same as the host where the IM server is listening.

Trusted hosts let you specify the domain and hostnames that are eligible to connect to your server and yours to theirs.