Configure keyword and regular expressions to enable InterScan™ Messaging Security Appliance (IMSA) to scan email message content. You can add several expressions to a list, and create your own.
To create an expression list and configure expressions:
Click Add or Edit from the Keyword Expressions screen. The configuration screen for keyword expression lists appears.
Next to List name, type a descriptive name.
Next to Match, select one of the following that specifies when IMSA takes action:
Any specified—Email message content can match any of the expressions in the list.
All specified—Email message content must match all the expressions in the list.
Not the specified—Email message content must not match any of the expressions in the list.
Only when combined score exceeds threshold—When you add an expression, you can set a score for it. Next to Total message score to trigger action, type a number that represents the threshold. When the total score of the matched keywords meets or exceeds the threshold, email message content can match the keyword list.
Score—Select a value ranging from -10 to 10 that represents the level of sensitivity when the presence of a keyword or expression would signify a spam. A higher value indicates a higher likelihood of a spam while a negative value reduces the chances of the message being considered a spam.
To create an expression, click Add. The Add Keyword Expression list appears.
Type the keywords. For a partial match, just type the keyword. To specify an exact match, use "\s" (without the quotes) before and after the key word. For example:
keyword matches "keywords", "akeyword", etc.
\skeyword\s matches "keyword" only.
If you selected Only when combined score exceeds threshold, select a score from the drop down box.
Click Save. The configuration screen for keyword expression lists reappears with the expression in the list.
To instruct IMSA to consider the capitalization of email content when it uses the filter, select the check box under Case sensitive.
Click Save to continue managing expression lists.
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