http://sourceforge.net/projects/eximdsn/

DSN Support for Exim. This patch allows Exim 4.xx to support the sending of email Delivery Status Notifications.

http://sourceforge.net/project/showfiles.php?group_id=121058

http://downloads.sourceforge.net/eximdsn/exim_463_dsn_1_3.patch?modtime=1158059382&big_mirror=0
http://switch.dl.sourceforge.net/sourceforge/eximdsn/exim_463_dsn_1_3.patch