Chapter 15 Security Profiles : Email filter : Configuring an Email Filters : Local Spam Filtering
  
Local Spam Filtering
The options in the section are ones can be managed on the local device without the need for a FortiGuard subscription.
The options available in this section, to be selected by checkbox are:
HELO DNS Lookup
Return Email DNS Check
Black White List - checking this option will produce a table that can be edited to create a number of BWL lists that can be separately configured and enabled.