If you don’t use anti-spam feature on Microsoft Exchange server you can uninstall anti-spam agents completely:

• Open Exchange Management Shell
• Navigate to C:\Program Files\Microsoft\Exchange Server\Scripts
• Run .\uninstall-AntispamAgents.ps1 cmdlet
• Confirm uninstall for each agent
  
  
• Restart Microsoft Exchange Transport service
• Open Exchange Management Console and confirm that Anti-Spam tab is gone from Organisation Configuration > Hub Transport
  

Windows Server 2008
Microsoft Exchange 2007