Configure commercial bulk email filter analysis
Steps
- 
                (If applicable) Mark the check box Use the results of the email hybrid service analysis for on-premises commercial bulk email analysis. 
                This option only displays when the Email Security Hybrid module is configured and running.
- 
                From the section Filter Properties, select the sensitivity level for the filter:
                - Normal: Analyze email sourceUse this option to set the filter to detect email only from indirect (third-party) sources of bulk email. 
- High: Analyze email source and contentUse this option to set the filter to detect both direct and indirect sources of bulk email. This is the default. 
 
- Normal: Analyze email source
- 
                (Optional) Mark the check box Bypass antispam analysis if message size exceeds. 
                In the text field, enter a message size in KB (default is 3072). Selection indicates to use message size to determine whether antispam analysis is bypassed.
- 
                Configure additional filter settings and click OK. The commercial bulk email filter settings are saved. 
                A commercial bulk default filter action can be used along with this filter. See Managing filter actions.