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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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Gotify
A simple server for sending and receiving messages in real-time per WebSocket. (Includes a sleek web-ui) (by gotify)
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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 https://mailinabox.email/ I use it and don't have any deliverability problems that I'm aware of. With at least one system that accidentally sent a couple hundred automated messages in about an hour and didn't get flagged at all.
IMO the simplest solution is gotify
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Mail-in-a-Box – Take back control of your email
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Small business owner: considering signi g up to Microsoft Office Premium for mail etc.