IceWarp Server has a built-in proxy server, which allows you to share Internet browser access across your network.
Your users will need to configure their browsers to use the proxy:
Typical Browser Configuration:

IceWarp Server IP is the actual IP address of the server where IceWarp Server is running.
The proxy server runs on the same port as the Web/Control service of IceWarp Server, which defaults to port 32000.