Public folders are one option for a group of users to access one inbox for a department email address. They also allow for users to send an email from the public folder's email address.
Articles (4)
How to access and add public folders as Favorites in Outlook 2016 and 2019.
How to access and add public folders as Favorites in the Office 365 online portal.
How to access public folders on a Mac via the Outlook 2016 Remote Desktop Application.