[KC Lemson] I often hit Alt+S by mistake while typing, which could be a very bad thing if the mail gets sent prematurely. I used to address the message, resolve the recipients, and then remove them from the To/Cc field and put them at the top of the body until I was ready to re-copy them into the appropriate fields.

A few years ago I stumbled on a much easier way to satisfy my obsessive compulsive behavior: type the recipients into the to/cc field and then type some junk like ‘jaskdlfadsf‘ into one of those fields as well. If you accidentally hit Alt+S, the message won’t send because it can’t resolve jaskdlfadsf.