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Adding new expressions to a content filter based on existing expressions allows you to re-use these items as a template.
To add new expressions:
  1. From the Content Filter tab, select one of the existing content filters; then, click Add Existing Content Filter.
  2. In the Add Content Filter window, select the content filters you want to use. You can select multiple expressions.
  3. Click OK.
Tip
Tip
Too many content filters in a mail scan rule can causes it to become unpredictably complex. Trend Micro recommends including one or two content filters per mail scan rule.
Keywords: content filters