IronPort - advanced configuration guide

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Cisco IronPort AsyncOS 7.6 for Email Advanced Configuration Guide
Chapter 6 Using Message Filters to Enforce Email Policies
the following filter immediately delivers a message if the sender has been bonded with the Cisco IronPort
Bonded Sender information services program:
whitelist_bondedsender:
SenderBase Reputation Rule
if (dnslist('query.bondedsender.org')) {
skip_filters();
}
Optionally, you can compare the result to a string using the equality (==) or inequality (!=) expressions.
The following filter drops a message that results in a “127.0.0.2” response from the server. If the
response is anything else, the rule returns “false” and the filter is ignored.
blacklist:
if (dnslist('dnsbl.example.domain') == '127.0.0.2') {
}
drop();
The reputation rule checks the SenderBase Reputation Score against another value. All the comparison
operators are allowed, such as >, ==,