Cisco Cisco Email Security Appliance C650 Guía Del Usuario
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AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide
Chapter 9 Using Message Filters to Enforce Email Policies
Message Filter Rules
To use smart identifiers in a filter, enter the following keywords in a filter rule that scans body or
attachment content:
attachment content:
Related Topics
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Smart Identifier Syntax
When you use a smart identifier in a filter rule, enter the smart-identifier keyword in quotes within a filter
rule that scans the body or attachment file, as in the example below:
rule that scans the body or attachment file, as in the example below:
You can also use smart identifiers in content filters and as a part of content dictionaries.
Note
You cannot combine a smart identifier key word with a normal regular expression or another key word.
For example the pattern
For example the pattern
*credit|*ssn
would not be valid.
Note
To minimize on false positives using the *SSN smart identifier, it may be helpful to use the *ssn smart
identifier along with other filter criteria. One example filter that can be used is the “only-body-contains”
filter condition. This will only evaluate the expression to be true if the search string is present in all of
the message body mime parts. For example, you could create the following filter:
identifier along with other filter criteria. One example filter that can be used is the “only-body-contains”
filter condition. This will only evaluate the expression to be true if the search string is present in all of
the message body mime parts. For example, you could create the following filter:
SSN-nohtml: if only-body-contains(“*ssn”) { duplicate-quarantine(“Policy”);}
Table 9-4
Smart Identifiers in Message Filters
Key Word
Smart Identifier
Description
*credit
Credit card number
Identifies 14-, 15-, and 16- digit credit
card numbers.
card numbers.
NOTE: The smart identifier does not
identify enRoute or JCB cards.
identify enRoute or JCB cards.
*aba
ABA routing number
Identifies ABA routing numbers.
*ssn
Social security number
Identifies U.S. social security
numbers. The *ssn smart identifier
identifies social security numbers with
dashes, periods and spaces.
numbers. The *ssn smart identifier
identifies social security numbers with
dashes, periods and spaces.
*cusip
CUSIP number
Identifies CUSIP numbers.
ID_Credit_Cards:
if(body-contains("*credit")){
notify("legaldept@example.com");
}
.