User Guide

11-7
AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide
Chapter 11 Content Filters
How Content Filters Work
Subject Header
Subject Header: Does the subject header match a certain pattern?
Contains terms in content dictionary: Does the subject header contain
any of the regular expressions or terms in the content dictionary
<dictionary name>?
To search for dictionary terms, the dictionary must already have been
created. See Content Dictionaries, page 21-2.
Note The dictionary-related conditions are only available if you have
one or more dictionaries enabled. For information about creating
content dictionaries, see Content Dictionaries, page 21-2.
Other Header
Header name: Does the message contain a specific header?
Header value: Does the value of that header match a certain pattern?
Header value contains terms in the content dictionary. Does the
specified header contain any of the regular expressions or terms in the
content dictionary named <dictionary name>?
To search for dictionary terms, the dictionary must already have been
created. See Content Dictionaries, page 21-2
Note The dictionary-related conditions are only available if you have
one or more dictionaries enabled. For information about creating
content dictionaries, see Content Dictionaries, page 21-2.
For an example showing how this option can be used, see Using Custom
Headers to Redirect URLs in Suspected Spam to the Cisco Web Security
Proxy: Configuration Example, page 13-11.
Table 11-1 Content Filter Conditions (continued)
Condition Description