You can delete a mailbox, for example when an employee leaves the company permanently. You can also make it inactive beforehand and keep it for legal reasons.
Mailbox Deactivation allows you to specify a date on which to make your mailbox inactive so that it can no longer send or receive messages.
To access this setting, log in to your console and go to Box Destruction via Messaging => Tools, the link is in the menu on the left of your screen.
After a period of three months following its deactivation, the mailbox is automatically destroyed.
However, you can delete a mailbox directly without deactivating it.
Use direct deletion with great care,
as a deleted MBR is no longer accessible, any deletion is final.