public java.util.List<ReceiptRuleSetMetadata> getRuleSets() {
        if (ruleSets == null) {
            ruleSets = new com.amazonaws.internal.SdkInternalList<ReceiptRuleSetMetadata>();
        }
        return ruleSets;
    }
<p>
The metadata for the currently active receipt rule set. The metadata consists of the rule set name and the
timestamp of when the rule set was created.
</p>

@return The metadata for the currently active receipt rule set. The metadata consists of the rule set name and
        the timestamp of when the rule set was created.
aws-java-sdk-ses/src/main/java/com/amazonaws/services/simpleemail/model/ListReceiptRuleSetsResult.java