Way back in the day when I was doing a lot of Exchange consulting work, we would recommend removing permission to send to all except for one or two specific acc

Way back in the day when I was doing a lot of Exchange consulting work, we would recommend removing permission to send to all except for one or two specific accounts. This was to avoid reply-all meltdowns, for security (viruses couldn't send to all), and also from an HR / internal communication perspective. We would recommend something similar for department-level groups, but often with a bit more freedom.