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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.
Then I automated the setup of a Linode VPS+Route53 DNS to create a recipient email server at the press of a button using ansible, will add other hosts to it like Digitalocean and DO DNS in time.
Another thing I recently saw is mailway.app
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Hence, a higher number means a more popular project.