Exclude userroles from sending a reviewmail

Hi,

I’m using your review-plugin and we really get a lot of reviews with it, so that is very nice.

Now I’m looking for the opportunity to exclude sending mails based on userroles, like our retailers (this is a userrole). So we would like to send the mails only to Guests.

Would this be possible to do? I don’t see how to do this.