If you need to enable duplicate emails at the system level, the setting is allowaccountssameemail. Before doing so, explain to the client that the system sends emails for various reasons (e.g. password resets, course enrollments, annual reminders, approaching deadlines, etc.). By enabling this setting and having multiple users with the same email address in the system, these emails may not behave as expected. If the client accepts, you may go ahead and enable the setting, but please get their acceptance in a DESK ticket (in writing) so we have a history if things go wrong later down the road.
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