OS X tip of the day: Replying to group e-mail.
Thursday October 11th, 2012
If you want to reply to a group e-mail but accidentally hit cmd+r to reply leaving just one email address in the To: form where the rest are in CC.
Just hit cmd+shift+r to tell Mail that you want to reply to all. It will automatically fill in the CC form for you.
This was found entirely by accident and that is the beauty of OS X. Little gems like this goes a long way.