Trend Micro InterScan Gateway Security Appliance M-Series ...

Trend Micro InterScan Gateway Security Appliance M-Series Administrator’s Guide
Spam Engine and Pattern File
The InterScan Gateway Security Appliance (the appliance) uses the Trend Micro
Anti-Spam Engine and Trend Micro spam pattern files to detect and take action
against spam messages. Trend Micro updates both the engine and pattern file frequently
and makes them available for download. The appliance can download these
components through a manual or scheduled update.
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The anti-spam engine uses spam signatures and heuristic rules to filter email
messages. It scans email messages and assigns a spam score to each one based on
how closely it matches the rules and patterns from the pattern file. The appliance
compares the spam score to the user-defined spam detection level. When the spam
score exceeds the detection level, the appliance takes action against the spam.
For example, spammers sometimes use numerous exclamation marks (!!!!) in
their email messages. When the appliance detects a message that uses exclamation
marks in this way, it increases the spam score for that email message.
Note: Rules in spam pattern differ from pattern to pattern; so, a mail judged as spam in a
previous pattern may not be treated as spam in current or later patterns.
Administrators cannot modify the method that the anti-spam engine uses to assign
spam scores, but they can adjust the detection levels that the appliance uses to decide
if messages are spam.
Hot Fixes, Patches, and Service Packs
After an official product release, Trend Micro often develops hot fixes, patches, and
service packs to address outstanding issues, enhance product performance, and add
new features.
The following is a summary of the items Trend Micro may release:
• Hot Fix—a work-around or solution to customer-reported issues. Trend Micro
develops and releases hot fixes to specific customers only.
• Security Patch—a single hot fix or group of hot fixes suitable for deployment to
all customers
• Patch—a group of security patches suitable for deployment to all customers
• Service Pack—significant feature enhancements that upgrade the product