Prevent Auto email response in case

Hi,

We have a situation where we work with a partner on our support service and therefore when we add their email address to our case we generate a circular communication that keeps both our cases open. The following is the workflow:

1. Open case
2. Add our partners support@ email address to case, so all three parties see communications
3. Case resolved
   1. Partner service desk platform closes the case
   2. Our platform (Creatio) sends an email asking for feedback on the case to both the case contact (customer) AND the partner
4. This causes the partners system to automatically reopen the case on their end

How can we at step 3.2 prevent the partner email being sent?

thanks

Mark