I evaluated it once, and ended up using https://mailcow.email https://mailcow.email I think the fact that it includes SoGO with Cal/CardDAV and active sync was

I evaluated it once, and ended up using https://mailcow.email https://mailcow.email I think the fact that it includes SoGO with Cal/CardDAV and active sync was the main reason, poste.io doesn’t seem to provide a solution for contacts and calendars. I’m still very happy with mailcow. And they include all features in the free version.