What's interesting is setting up a handler for DMARC aggregated feedback reports. I determined that it's not worth doing yourself, even Microsoft do not handle their own DMARC reports.

I ended up outsourcing DMARC report processing, if I wanted to do it in-house I'd have to setup and maintain an Elastic stack[1] which seems like huge overkill.

[1] https://domainaware.github.io/parsedmarc/