Recently I have played around with the Open Source mass mailer KumoMTA. And off course when using such a tool you want to see statistics on how the mail servers is performing.
For this I installed a logstash instance on the KumoMTA server and configured it to accept http requests. With that I was able to configure KumoMTA to inject logs using webhooks into logstash.
And with that logstash was the middleman to inject the data into Elasticsearch. Then lastly the Kibana UI was required to make some nice dashboards to show statistics on the mail performance.
