Nagios sends out emails for remte checks. but for failing check-mk-agent checks, notifications do not work. This can be related to this: "After update to 1.2.2.p1 email notifications not working":http://lists.mathias-kettner.de/pipermail/checkmk-en/2013-July/009827.html http://mathias-kettner.de/checkmk_flexible_notifications.html *(from redmine: created on 2014-11-20, closed on 2014-11-20)*