Turn off notifications sent externally to supplier in Test environments

Summary:

Hi Oracle Community,

Is there a way in Test environments to turn off emails sent externally eg: emails to suppliers such as POs, whilst leaving other notifications that are sent to Users of Oracle Fusion on eg: FYI requisition approved or receipt required emails.

I know we can globally turn off notifications in the preferences but that also prevents internal emails being sent out which we would like to examine due to the Redwood updates.

Thank you