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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
you could look into DMARC: https://seanthegeek.net/459/demystifying-dmarc/ It's build upon SPF and DKIM, so thats good, but it means you will get periodic mail reports from other mailservers that needs to be processed, and aside from free tiers of paid providers (like dmarcian), there is only one selfhosted solution that I know of: https://github.com/domainaware/parsedmarc
There is also a wip project for monitoring your mail delivery called Lightmeter ControlCenter: https://gitlab.com/lightmeter/controlcenter It monitors your MTA (Postfix) logs and also checks your IP against blocklists. I haven't had the chance to try it yet, but looks promising.