When you enable mailboxes, the Mailboxes section appears in the menu of the EACAT Procedures administration manager's Space, and the Mailboxes subsection appears within the Users and Services sections.
Within the Mailboxes section , the global mailbox is automatically created, which contains all the services of your entity. This mailbox is different from the others because it only has services assigned and not users. If you assign a user to it, they will be able to see and work in all services.
From here, you can create other specific mailboxes , up to your organization's quota; and in each assign the services and add the users who will work there. Before doing so, spend time thinking about the organizational logic that best suits the needs of your organization.
Find related information at
EGT - What are mailboxes
EGT - When do you have to use the mailboxes?
EGT - What are mailboxes for?