public void setIpExpression(RuleIpExpression ipExpression) {
        this.ipExpression = ipExpression;
    }
<p>
The condition applies to an IP address expression passed in this field.
</p>

@param ipExpression
       The condition applies to an IP address expression passed in this field.
aws-java-sdk-mailmanager/src/main/java/com/amazonaws/services/mailmanager/model/RuleCondition.java