Have a look at mailcow (https://github.com/mailcow/mailcow-dockerized https://github.com/mailcow/mailcow-dockerized). Basically Docker images for Sogo and every

Have a look at mailcow (https://github.com/mailcow/mailcow-dockerized https://github.com/mailcow/mailcow-dockerized). Basically Docker images for Sogo and everything else (postfix, dspam, dovecot, etc). I'm also stuck on Zimbra, but planning a move for me and my dozen users. I really like Zimbra's calendar sharing features, but Sogo seems to have a good implementation too.