Add users to Zulip Each mailbox can be added to the Zulip ecosystem, and only same-domain users can collaborate in our Zulip integration. Adding external collaborators to Zulip is possible only if you create an e-mail address for them. Adding a new user to Zulip Go to the  Admin Panel . Log in using your Admin username and password. Click on  Zulip  in the menu bar. Select the desired  domain  from the drop-down. Click on the  Add  button.       A new window with a list of users from the domain will show. Select the users you wish to activate Zulip for.  Click on the  Allow  button. Allow up to 5 minutes for the system to add the users to the Zulip ecosystem.       The allowed users on Zulip will show in the list.