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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.
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emailwiz
Script that installs/configures a Dovecot, Postfix, Spam Assassin, OpenDKIM Debian web server
Mailcow should be the answer here.
I've had good success with Modoboa. It's the only one I've found that has both a GUI and decent LDAP integration. There are a few containerized versions out there, though you should definitely be sure to update modoboa after deployment if you use them: https://github.com/modoboa/modoboa
Someone once posted this repo on this subreddit some time ago: https://github.com/LukeSmithxyz/emailwiz
NOTE:
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Hence, a higher number means a more popular project.