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Re:How to Live Without Google by qznc on Thursday September 14, 2017 @10:45AM (#15248519)
I use mailbox.org, they use a customized Open-Xchange. Not sure if it is the open source community edition, though.
Re:How to Live Without Google by omnimus on Thursday September 14, 2017 @11:51AM (#15249202)
I use mailbox too. It is privacy minded email/caldav host with great price and nice ui.

I am not sure if they use any proprietary software though.