I’m developing the samba file server and mail server configurations. I’ll send testing updates ASAP! 
BTW I’m proud of the future configuration for samba, dovecot and postfix: about 4K lines of code removed and still we’ve the (almost) the same funtionalities 
https://github.com/NethServer/nethserver-samba/compare/v7...DavidePrincipi:v7
https://github.com/NethServer/nethserver-mail-server/compare/v7...DavidePrincipi:v7
Thanks to the great work of upstream developers on sssd and samba4 domain controller 
This is the BEST NethServer ever
Now I think we’ve to make our part, by improving the esmith::DB and let it talk with other daemons on dbus.