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FOSS email providers?
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
migadu has been pretty solid the last few years and they've got some great pricing on plans that'll be sufficient to host an entire family.