AddToAddressBookCM is a contextual menu item for creating Address Book cards in a new group using the senders of selected Apple Mail messages.
The program has a corresponding System Preferences pane for configuring and activating it for the first time
To use AddToAddressBookCM: Control click on one or more messages in a message viewer list to expose the contextual menu. Then select the menu item named "Add to Address Book" to Create cards for each message selected using the sender of the message