Last modified: 2009-07-07 02:50:56 UTC
The preference "Send me copies of e-mails I send to other users" cant be overridden for individual emails sent. Some people don't like receiving copies of all emails they send, but occasionally need to keep a copy for their records, and it would be easier to change the pref for just those emails rather than change their preferences, send the email, restore the preference.
This feature already exists. Sorry.