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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.
The closest option to that, currently, would be https://mailway.app, built by someone who now works with Cloudflare: u/svensauleau
I self-host mailcow for this purpose, it's an open source configured and dockerized Postfix + Dovecot + many niceties, plus an admin UI to manage everything.
NOTE:
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Hence, a higher number means a more popular project.