I has a Zimbra server that handles example.com. So my users were firstname.lastname@example.org. I added another domain example1.com, now I can create users like email@example.com. All users log in through example.com, but now they have to type the domain name as part of their username. i understand there is a way to give example1.com another login url that will enable @example1.com users to just enter their username like: joeblow or mike (without entering the domain name after @).
Do I need to register another domain name for that and in the admin panel add a virtual host for example1.com?