Enable email filtering
Unlike antivirus protection, no single control enables all email filtering. Your FortiGate unit uses many techniques to detect spam; some may not be appropriate for every situation. For this reason, when you enable email filtering, you must then choose when techniques are applied to email traffic.
To enable email filtering
1. Go to Security Profiles > Email Filter > Profile.
The default email filter profile is presented. You can edit this profile or create a new one.
2. Select the Inspection Mode.
Proxy detection involves buffering the file and examining it as a whole. Advantages of proxy-based detection include a more thorough examination of attachments, especially archive formats and nesting.
Flow-based detection examines the file as it passes through the FortiGate unit without any buffering. Advantages of flow-based detection include speed and no interruption of detection during conserve mode.
3. Select Enable Spam Detection and Filtering.
4. If you wish to leave everything in it’s default setting you can select OK or Apply.
Once you have enabled the email filter you can further specify what protocols to inspect.