MailFollowup  1.5

The MailFollowUp adds a "Follow Up" item to the Message and contextual menus (and optional toolbar item) of Apple's Mail application that allows you to compose (and then send) a quoted version of the original message to all of the original recipients, keeping the To, Cc and Bcc addresses exactly as they appeared in the original message. Hawk Wings has a nice description of it, and Dan Frakes wrote about it in January of 2007. If you are using OS X 10.8 Mountain Lion and have installation difficulties please see here.