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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.
It is probably a band-aid solution then. I did also look at MailU which I've been toying with setting up next week sometime as it also looks pretty good for my purposes. That may also be an option too. It's more of an all-in-one mail solution, so you would be able to use an Android App once configured to connect to your server.
Mailcow: https://github.com/mailcow/mailcow-dockerized
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