POSTFIX (25)
           |
           V
   Check_Client_Access
     |            |
    Yes           No
     |            |
     V            V
Content_Filter  DSpaM (Deliver to: 10025)
     |            |
     V            V
  ClamSMPT     ClamSMTP 
     |            |
     --------------
            |
            V
        Reinject (10026)