Chapter 10 Install and System Administration for FortiOS 5.0 : Advanced concepts : Replacement messages list : MM1 replacement messages
  
MM1 replacement messages
MM1 replacement messages are sent when, during MMS content scanning, FortiOS Carrier detects, for example a virus, using the MMS profile.
You must have Remove Blocked selected within the MMS profile if you want to remove the content that is intercepted during MMS scanning on the FortiGate unit.
See Also
Modifying replacement messages
Replacement messages list
Adding images to replacement messages