I searched the forum and haven’t found a satisfactory answer so here goes.
How come the Dreamhost systems don’t allow someone to login to check mail using their email address as the username (other than webmail of course) if it’s associated with a mailbox account? The email address is definitely going to be unique. It’s just confusing to users when they have this totally separate username from their email address. I know about making accounts so it’s not mXXXXXXX, but that’s only a little better.