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postwhite
Script for generating a whitelist for Postfix's Postscreen based on large senders' SPF records
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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.
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yunohost
YunoHost is an operating system aiming to simplify as much as possible the administration of a server. This repository corresponds to the core code, written mostly in Python and Bash.
Use Postcreen to cut down on spam bots and use postwhite to whitelist common legitimate email senders.
use mailsieve scripts, they are amazing. Checkout sieve originally just a thunderbird addon but you can install it as a desktop app, hosted web application or build your own docker container.
No, I use Mailcow Dockerized.
If your willing to do some tinkering I recommend simple-nixos-mailserver. I don't use nixos much, but I do find its very good at this one thing.
If you want a more turn-key solution, consider yunohost
Oh, and finally if you want a website like gmail to view your email, I recommend nextcloud and rainloop.