Cisco Cisco Email Security Appliance C170 Guia Do Utilizador
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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
for a SBRS score of “none” using the
no-reputation
rule described below. The following example
adjusts the “Subject:” line of a message to be prefixed by “
*** BadRep ***
” if the reputation score
returned from the SenderBase Reputation Service is below a threshold of -7.5..
For more information, see the “Sender Reputation Filtering” chapter. See also
Values for the SenderBase Reputation rule are -10 through 10, but the value
NONE
may also be returned.
To check specifically for the value
NONE
, use the
no-reputation
rule.
Dictionary Rules
The
dictionary-match(<
dictonary_name>) rule evaluates to
true
if the message body contains any of
the regular expressions or terms in the content dictionary named “dictonary_name.” If the dictionary
does not exist, the rule evaluates to
does not exist, the rule evaluates to
false
. For more information on defining dictionaries (including their
case sensitivity and word boundary settings), see the “Text Resources” chapter.
The following filter blind carbon copies the administrator when the Cisco scans a message that contains
any words within the dictionary named “secret_words.”
any words within the dictionary named “secret_words.”
note_bad_reps:
if (reputation < -7.5) {
strip-header ('Subject');
insert-header ('Subject', '*** BadRep $Reputation *** $Subject');
}
none_rep:
if (no-reputation) {
strip-header ('Subject');
insert-header ('Subject', '*** Reputation = NONE *** $Subject');
}
copy_codenames:
if (dictionary-match ('secret_words')) {
bcc('administrator@example.com');
}