Hey you, you know, the one who asks for our email addresses to register in to a forum.
Don't email a registered user and then CC everyone else that is registered on the board. What you just did was give any spam house that has a nym registered on the forum a complete list of email addresses to spam to.
Instead, email each directly or email your self and BCC all the others. At the very least, this will imply that you intend to keep the members information private.