Trend Micro InterScan M Series, Administrator'S Manual

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Trend Micro™ InterScan™ Gateway Security Appliance M-Series Administrator’s Guide
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To configure SMTP Content Filtering – Target for SMTP traffic:
1. From the left-side menu, click SMTP > Content Filtering. The Target tab
appears.
2. Select the Enable SMTP content filtering check box.
3. Set any of the following message filters that you need. (They are all optional):
• Filter by Message Size. The Trend Micro recommended size is 5 MB.
Larger file sizes can reduce the appliance throughput. If the message exceeds
the size set in the filter, it will bypass scanning by the size filter and continue
to the next filter.
• Filter by Text in Message Header. Enter one or more words for InterScan
Gateway Security Appliance to check for when scanning content in the
subject line of email.
• Filter by Text in Message Body. Enter one or more words for InterScan
Gateway Security Appliance to check for when scanning content in the body
of email.
For the above two filters, Header and Body, you can select Match case.
InterScan Gateway Security Appliance will identify only items that match
the case of the words added to the list.
• Filter by Message Attachment Name . To filter attachments by file name,
enter one or more words for InterScan Gateway Security Appliance to check
for when scanning attachment names.
• Filter by True File Type - To filter messages based on attachment type,
select one or more of the items in the Attachment True File Type box.
Note: The True File Type filter does not support scanning of contents contained
within compressed files. For example, if the administrator selects only
Microsoft documents from the list, and you receive a message with a
compressed (zip) file and the zip file contains a ".doc" or ".xls" file, the filter
will not be triggered.
4. Click Save.