Just a short one on how to enable the Anti-Spam function on the Hub Transport server, this is written for Microsoft Exchange Server 2010 however it is the same process for Exchange 2007 also. This ads some useful functions like IP Block list Providers, Sender Reputation and Content Filtering options.

First close your Exchange Management Console (if you have it open) on the Hub Transport server

Exchange Management Shell

Then open up the Exchange Management Shell. It should be in Start – All Programs – Microsoft Exchange Server 2010 – Exchange Management Shell

It should look something like this below.

Now we are going to run the following command.

Set-TransportServer -Identity ‘Your Hub Transport Servers Name’ -AntispamAgentsEnabled $true

It should look something like the below, substituting your server name for the mail-server part of course.
Set-TransportServer -Identity ‘mail-server’ -AntispamAgentsEnabled $true 

Now when you go back into your Exchange Management Console you will have a couple of new tabs in your Organization Configuration -> Hub Transport and also in your Server Configuration -> Hub Transport both new options are called Anti-Spam and are shown below. Checkout whats in them and I might put up a few additional help blog posts on adding functionality with filtering settings and whatnot at a later stage.

Happy Exchange 2010′ing. Questions in the comments. Cheers