@Bean("webhookSender")
    @ConditionalOnProperty(name = WebhookModule.NAME, havingValue = "false")
    public WebhookSender webhookSenderEmpty() {
        return new WebhookSenderEmptyImpl();
    }
JavaMailSenderImpl Properties
<a href="https://javaee.github.io/javamail/docs/api/com/sun/mail/smtp/package-summary.html">...</a>
batch-alarmsender/src/main/java/com/navercorp/pinpoint/batch/alarm/AlarmSenderConfiguration.java