In webforms, how often do you see the absence of "CC me" or "Here is your message, and your comments have been submitted"?

I am referring to acknowledgement of reciept of the content of the message. When you have to use a webform in a website, to send the site an email, (some of them don’t have an address that allows you to send it from your email account) how often to you see a box for “copy to me” “CC me”? Or, when you click send, how often do you get just “thank you for your message”, and how often do you get Here is the copy of your message, and thank you”