Configuring dictionary options
The Dictionary section of antispam profiles lets you configure the FortiMail unit to use dictionary profiles to determine if the email is likely to be spam. If the FortiMail unit considers email to be spam, it performs the associated action.
Before you can use this feature, you must have existing dictionary profiles. For information on creating dictionary profiles, see
“Configuring dictionary profiles”.
When dictionary scanning is enabled and an email is found to contain a dictionary word, FortiMail units add X-FEAS-DICTIONARY: to the message header, followed by the dictionary word or pattern found in the email. The header may be useful for troubleshooting purposes, when determining which dictionary word or pattern caused an email to be blocked.
Unlike banned word scans, dictionary scans are more resource-intensive. If you do not require dictionary features such as regular expressions, consider using a banned word scan instead.
To configure dictionary scan options
1. When configuring an antispam profile, enable Dictionary in the AntiSpam Profile dialog.
2. Click the arrow to expand Dictionary.
3. From Action, select the action profile that you want the FortiMail unit to use if the heuristic scan finds spam email.
4. From the With dictionary group drop-down list, select the name of a group of dictionary profiles to use with the dictionary scan. Or, from the With dictionary profile drop-down list, select the name of a dictionary profile to use with the dictionary scan.
5. In the Minimum dictionary score field, enter the number of dictionary term matches above which the email will be considered to be spam. Note that the score value is based on individual dictionary profile matches, not the dictionary group matches.
6. Continue to the next section, or click Create or OK to save the antispam profile.