Configure the tag format
When the spam action is set to Tagged, the Tag Format setting determines what text is used as the tag applied to the message.
To configure the tag format
1. Go to Security Profiles > Email Filter > Profile.
2. The default email filter profile is presented. To edit another profile, select it from the drop down in the Edit Email Filter Profile title bar.
3. Select Enable Spam Detection and Filtering.
4. Select the types of email that you want the FortiGate unit to examine when using this email filter profile.
5. Select Apply.
6. The Tag Format row has a field for each traffic type. Note that if the spam action for SMTP traffic is set to discard, the tag format will not be available.Enter the text the FortiGate unit will use as the tag for each traffic type.
7. Select Apply.