If you call your provider , they have an email acct that you can foreword those to . That's how they find and prosecute these people. I almost fell of my chair one day a few years back when I sat down to check my emails and someone had sent child porn to my inbox
. I called the Police to ask what to do about/with it and they said to call my provider. My provider said some of them they take care of and some are forwarded directly to the FBI. They lady I spoke with said mine would be going to the FBI.