enable anti-spam on exchange 2010 hub transport

http://technet.microsoft.com/en-us/library/bb201691.aspx

its not installed by default on exchange 2010 hub transport,

quite useful for blocking users sending to non-users in AD

Run the Install-AntispamAgents.ps1 script

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You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "Hub Transport server" entry in the Transport Permissions topic.

1. Run the following command from the %system drive%/Program Files\Microsoft\Exchange Server\V14\Scripts folder.
   
   .\install-AntispamAgents.ps1
   
   

2. After the script has run, restart the Microsoft Exchange Transport service by running the following command.
   
   Restart-Service MSExchangeTransport