Restrict email view sent to only emails sent by each user

We have temporary staff that use the inbuilt erpnext email system. Our accounts team also use the inbuilt erpnext email. Problem is that if the temporary staff when in the Email Inbox select “Sent Mail” they can see all emails sent from the erpnext system, including confidential emails sent by other staff. I note that if I remove the Role Profile they only can see the emails they send, but this also stops emails from appearing in their email inbox. Anyone know permissions to set to resolve this?

Hi, we are still using erpnext 7. Having this same issue. Were you able to resolve it?!