Restricting end users from being added to tickets that are not on the tickets domain

Hi,

Following some recent security incidents where end-users with duplicate names are being added into tickets by accident and then information being sent to them has caused some issues, I was hoping Zendesk could offer a restriction whereby an end-user could only be added as a requester or CC contact if their domain fits inside the organisation of the ticket. And if you wish to add someone outside of the tickets organisation domain, then provide a pop-up notification to verify you wish to add that end user.

Human error exists, I understand that, but I need to find a way to mitigate this where possible.

Looking for guidance on how the community are handling this situation.