@Override
        public OptionalThing<String> getLastServerResponse() {
            return OptionalThing.of("Mock response");
        }

        @Override
        public OptionalThing<Integer> getLastReturnCode() {
            return OptionalThing.of(200);
        }

        @Override
        public java.util.Map<String, org.dbflute.mail.send.supplement.attachment.SMailReadAttachedData> getSavedAttachmentMap() {