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Mail-in-a-Box
Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box.
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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.
Have a look at mail-in-a-box which worked great for a friend of mine (I'm a bit oldschool when it comes to mail servers and do the whole setup by hand - opensmtpd, rspamd (which also does dkim-signing!), dovecot nowadays, coming from a classical postfix-spamassassin-dovecot setup) but you might need to clean up your installation/reinstall your VPS to start anew to avoid conflicts and/or errors during setup.
Also have a look at Mailcow Dockerized ( https://mailcow.email/ ), works like a charm for me.
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