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I've used https://mailu.io. It works well, but your biggest problem is going to be getting over the spam filter hurdles of the email giants of the world. Even if everything is properly configured (including dkim / spf / whatever else they've added) your messages will get plopped in the spam folder.
I evaluated it once, and ended up using https://mailcow.email
I think the fact that it includes SoGO with Cal/CardDAV and active sync was the main reason, poste.io doesnโt seem to provide a solution for contacts and calendars.
Iโm still very happy with mailcow. And they include all features in the free version.
I really like MOX approach: https://github.com/mjl-/mox for self hosting email.
https://github.com/postalsys/emailengine
Seems open-source to me.