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free-email-forwarding
The best free email forwarding for custom domains. Visit our website to get started (SMTP server)
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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.
This looks a lot like a direct clone of https://forwardemail.net/, except that ImprovMX isn't open source. I wonder which came first?
I like simplelogin.io (also open source, so can be selfhosted) because the aliases can be used to send and receive, though you do have to set the domain up on their platform first.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.