DMX 05.03.06 included a fix on notifications which unfortunately introduced a new bug. This meant that many more people could get email notifications of DMX changes than were supposed to. This is the most important fix for this release. Check full list here:
http://www.bring2mind.net/Support/Forums/tabid/143/aff/26/aft/8250/afv/topic/Default.aspx
Find the upgrade through the usual channels.