Some people care greatly about these issues, while some people don't see what is the big deal. I think it comes down to two things, how long you've been getting email, and how much email you get. Sooner or later the newbie will pick up some of the more obvious rules. To some people this will seem more like a rant, rather than a white paper. It's not meant that way.
CC stands for C arbon C opy .
You use this to send the same email to multiple people. However, everyone you send it to will see everyone else's email address. This is bad etiquette unless all the people know each other. I've had people say that I'm getting upset over nothing. Most people only have one email address, while others like me have multiple emails.