Added: on Addresses, each team mailbox shows who can open it. A team admin chooses Everyone in the team, for a shared address such as help@, or Only one member, which makes the mailbox private to them. A private mailbox opens only for that member. New team mailboxes start open to everyone.
Choose who can open a team mailbox
A team admin can make a team mailbox private to one member, or open to everyone in the team.