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Mailcow should be the answer here.
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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
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InfluxDB
Access the most powerful time series database as a service. Ingest, store, & analyze all types of time series data in a fully-managed, purpose-built database. Keep data forever with low-cost storage and superior data compression.
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emailwiz
Script that installs/configures a Dovecot, Postfix, Spam Assassin, OpenDKIM Debian web server
Someone once posted this repo on this subreddit some time ago: https://github.com/LukeSmithxyz/emailwiz