Cisco Cisco Email Security Appliance C170 사용자 가이드
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Cisco AsyncOS 9.1 for Email User Guide
Chapter 9 Using Message Filters to Enforce Email Policies
Message Filter Rules
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True Rule
The
true
rule matches all messages. For example, the following rule changes the IP interface to external
for all messages it tests.
Valid Rule
The
valid
rule returns false if the message contains unparsable/invalid MIME parts and true otherwise.
For example, the following rule drops all unparsable messages it tests.
externalFilter:
if (true)
{
alt-src-host('external');
}
not-valid-mime:
if not valid
{