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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.
I recommend you Mailu. It's a Docker-based collection of software (and of course, it only contains free software for sure). You can easily setup your email server with minimal effort. You still have to read their documentation but it isn't that difficult that much.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.