How to Configure Proxy for Messagelabs

[mredv]

Hello,

we are using BM38SP5 for surfing the net. Now we want to implement the Web Security Service ( URL Filtering, Anti Spyware ) from Messagelabs.
How do I have configure this on the BM ?
I received from Messagelabs the Proxy Service Port 3128 .
They told me to redirect all HTTP traffic to the following hostname as our upstream proxy EMEA.
Last they give me the Web Security Service Proxy Address.

Thanks in advance

Martin