Aware this is an old thread, but as per some of the other comments below, we use a single email distribution list under 1 email address with 200+ people on it (who are not all Adobe users), so this stops the report sending to everyone - can we disable the "opt out" section?

That only works if all the recipients are set up as Adobe user though doesnt it? We have the same issue where we email some summary reports to 200+ recipients, but many of them dont have (or need) adobe logins as they only look at 1 report on a daily/weekly basis