I worked in a very conservative industry back then and I was very junior and prone to mistakes. If you are sending confidential emails, send it to yourself first. That way, you can also capture any formatting mistakes that might appear differently once someone receives the email, or any mistakes in general. Once you are happy with the email, remove the to: and info on top and your signature if any, and send it to people the email is intended to. A lot more work but I used to do this for very confidential emails, or emails that are super important and will be scrutinised all over.