Hello,
Personally I have having issues on my hosted domain setting-up and troubleshooting DMARC config. There are a coupe of opensource projects that help with this but I have come across issues getting the containers working, and the only alternative is to buy a SaaS service it look at the reports.
This project appears to be a good option https://github.com/patschi/parsedmarc-dockerized
Could it be added to the BigBearCasaOS Store please?
Thanks