Scott, I am having an issue with messages.....

I contacted a user on my website and asked if I could upload some photos for her. She agreed, so I logged in and switched user accounts so I was logged in as her. I did a bulk upload and uploaded 25 photos to one album. Then I approved them. She just emailed me back saying that she just got 25 emails!!! Are the emails sent out once they are approved? Can I disable this somehow. I don't really need to let my users know if there photos have been approved/disapproved - I just need to moderate them. Thanks!