I have an Ubuntu 14.04 server that runs Samba4 as Active Directory PDC. The server is called athena and its DNS name is athena.ad.domain.com. The realm is AD.DOMAIN.COM and the NetBIOS name is DOMAIN.
When I look at my users, their usernames are firstname.lastname@example.org. What I want is that they have email@example.com. Nothing else has to change, but can change if necessary.
I tried to change the realms in both
/etc/krb.conf and then change the user's account to firstname.lastname@example.org, but when I did that, I couldn't login anymore. So at the moment, I'm back to the previous (working) configuration.
Do I need to reprovision Samba (with samba-tool domain provision)? Will the users be kept?