Chapter 13 Logging and Reporting : Logging and reporting overview : FortiOS features available for logging : Email filter
  
Email filter
Email filter logs, also referred to as spam filter logs, records information regarding the content within email messages. For example, within an email filter profile, a match is found that finds the email message to be considered spam.
Email filter logs are recorded when the FortiGate unit finds a match within the email filter profile and logging settings are enabled within the profile.