As I'm migrating stuff from lots of users on other servers to ISPconfig, I bump into this issue; Some of the older servers were purely based on local linux users with /etc/shadow passwords and maildirs in their /home/user/ dirs, and some of them shared the same domain names and domain aliases as their @domain for mail. They are supposed to be different clients on my ISPconfig server though. Is this possible? firstname.lastname@example.org also often used email@example.com, and he logged in using carlos of course. But so did firstname.lastname@example.org, who also often used email@example.com. Now Carlos and Carol are different Clients on ISPconfig 3.1dev. Is there still a way to accomplish the domain sharing between them? I searched in the docs, but could not find out how to set this up.