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Mail-in-a-Box
https://mailinabox.email/, posted 2014 by peter in communication email free opensource virtualization
Mail-in-a-Box turns a fresh cloud computer into a working mail server.
You get contact synchronization, spam filtering, and so on. On your phone, you can use apps like K-9 Mail and CardDAV-Sync free beta to sync your email and contacts between your phone and your box. And in your browser: