You can create content filters that define what portions of the message to scan, and
use them as elements for other content filters. For example, create a content filter
for scanning the Subject header, another for Attachments, and another to include all
parts of the mail; then, use these filters as building blocks for your content filter.
To add a new content filter:
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From the content filter workspace, click Add Expression.
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From the Add Expressions window, click the expressions you want to add. You can select multiple expressions.
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Click OK.
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NoteToo many expressions in a content filter can cause it to become unpredictably complex.
Trend Micro recommends including one or two expressions per content filter.
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