Exchange 2007 has continued to improve upon its Anti Spam features with each version of the product. In this article I want to focus on installing and configuring the antispam agent on a hub transport server.
By default the agents are not installed on the hub role since this server is intended to be a down stream server behind an Exchange Edge Server. Throughout the article you will see that some features can be manged via EMC and a number of features must be managed via EMS.

Installing Anti Spam Agents
By default the Anti Spam agents are not installed on the hub servers ***these must be installed on each hub that you want to utilze the agents ****

Open EMC
Organizational Configuration
Select the Hub Transport Server
EMC
As you can see there is no reference to the anti spam agents

Lets go ahead and install the Agents”

1. Open EMS
2. you can change to the directory or input the path to the powershell script (I chose to change to the directory) Change to C:\progroam files\Microsoft\Exchange Server\Scripts (assuming install directory is default)
3. ./install-AntiSpamAgents.ps1
Installation on EMS
After the agents are installed the Transport Service needs to be restarted

Lets go back to EMC–Organizational Configuration — Hub Transport
EMC Antispam Tab appears
We now have an Anti Spam Tab with a number of items to configure

CONFIGURATION:
Now that we have installed our Anti Spam Agents lets take a look at what we can configure. Some configuration can only be done from EMS and some can be done from both EMS and EMC.
Content Filtering
IP Allow List
IP Allow List Providers
IP Block List
IP Block List Providers
Recpient Filtering
Sender Filtering
Sender ID
Sender Reputation

Content Filtering:
When the Content Filter agent is enabled on a computer, the Content Filter agent filters all messages that come through all Receive connectors on that computer. Only messages that come from external sources are filtered. External sources are defined as non-authenticated sources that are considered anonymous Internet sources.

http://technet.microsoft.com/en-us/library/bb124739.aspx

Content filter provides us with 3 tabs that we can configure
1. Custom Words
2. Exceptions
3. Action