Chapter 4 FortiOS Carrier : MMS Security features : MMS virus scanning : MMS virus monitoring
  
MMS virus monitoring
To enable MMS virus monitoring, expand MMS Scanning and enable Monitor only for the selected MMS types.
This feature causes the FortiOS Carrier unit to record log messages when MMS scanning options find a virus, match a file name, or match content using any of the other MMS scanning options. Selecting this option enables reporting on viruses and other problems in MMS traffic without affecting users.