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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.
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migadu.com. Have been using them for quite a while and it works really well if your main goal is to have a few inboxes to receive email and do not want to mass-email anyone.
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.