Use this command to configure global deepheader-analysis scan settings used by antispam profiles.
Deepheader analysis examines the entire message header for spam characteristics.
Not all headers may be checked, depending on your configuration of antispam trusted.
config antispam deepheader-analysis
Type the confidence percentage above which a message will be considered spam. The deep header scan examines each message and calculates a confidence value based on the results of the decision-tree analysis.
The higher the calculated confidence value, the more likely the message is considered spam.
The deep header scan adds an
Type the grey scale threshold above which the deepheader scan will be skipped.
FortiGuard antispam service uses the grey scale of 1-9 to determine spam. 1-4 means the email is a spam for sure, while 9 is not a spam for sure.
Therefore, increasing this grey scale level will increase the probability to scan the email. This may increase spam catch rate but also increase false positives.