Any email that goes to a distribution list of more than 50 people needs a maths check (even "whats 5+3") to stop people sending it without thinking. Any email intended to go to more than 50 people (not on an official list) should just bring up an alert that says "stop it, go find a real mass mailer".
It's been like this since I joined the workforce. How has no-one fixed this kind of thing in the last 25 years?