How To Prevent Someone From Using "Reply All" To Emails You Send

How do I prevent someone from using 'reply all' to e-mails I send?

To prevent someone from using "reply to all" on business emails I send, perhaps when you send out the business email, type “Please don't reply to all, just reply to sender”. It's being very specific and up front, so you are ensuring that someone doesn't hit “reply to all”. You can also specify no reply needed, with “NRN”.