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DMARC (Domain-based Message Authentication, Reporting and Conformance) is one such protocol. DMARC allows domain administrators to apply policies with regard to email authentication. This article shows how you can use existing open-source tools to visualize these reports in a graphical way, self-hosted on your own servers, without having to submit your reports to a third party. The DMARC reports are sent as XML files, but are not very practical for humans to read, especially not since you may receive several of them every day. There are several templates for visualizing the output using eg., Grafana, Splunk, or Kibana.
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