Request a shared mailbox (SCSU email account that can be used by multiple people).
How to add and remove users from a shared mailbox account using the group management tool (Cayosoft). This can also be used for department files.
How to open a Shared Mailbox or Calendar on Outlook for Windows, Apple, or on the Web.
Sending on behalf of mailbox
How to change your shared mailbox display name
What to do if I have two emails showing up in the GAL and users are using the wrong one
Differences between Shared Mailboxes and Supplemental Accounts
How to share your Outlook mailbox or calendar
How to share your Outlook mailbox or calendar