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Normal: Analyze email source. Use this option if you want the filter to detect email only from indirect (third-party) sources of bulk email (default).
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High: Analyze email source and content. Use this option if you want the filter to detect both direct and indirect sources of bulk email.
If you want message size to determine whether commercial bulk email analysis is bypassed, mark the Bypass commercial bulk email detection if message size exceeds check box and enter a message size in KB (default is 1024).