public void setIpExpression(IngressIpv4Expression ipExpression) {
        this.ipExpression = ipExpression;
    }
<p>
This represents an IP based condition matching on the incoming mail. It performs the operation configured in
'Operator' and evaluates the 'Protocol' object against the 'Value'.
</p>

@param ipExpression
       This represents an IP based condition matching on the incoming mail. It performs the operation configured
       in 'Operator' and evaluates the 'Protocol' object against the 'Value'.
aws-java-sdk-mailmanager/src/main/java/com/amazonaws/services/mailmanager/model/PolicyCondition.java