Fusion ERP - mask all user email address including internal users and supplier contacts

Summary:

Hi Experts,

Use case: Need to stop emails go out from NonProd Fusion ERP environments it includes all type of email notifications. For testing purpose we need workflow emails send out for a smaller group of internal team.
We gone through documents and through Oracle support we understood that, at pod level cannot restrict particular domain due to shared infra.

We can make control BPM and OTBI reports with in application but still grey area on email notifications for supplier contacts….etc

So we are looking to mask user email addresses as part of post refresh which includes internal and supplier users. we can keep read email-ID for required team. In this, we will be confident that no emails go out from NonProd instance.