Nagios3 / Ubuntu wont send email

Email just wouldn't come. No errors, no log output, nada. Turns out there is a deployment bug, #387069 but the fix hasn't seemingly fed back into Ubuntu 9.04, so for my info:

sudo /etc/init.d/nagios3 stop
sudo dpkg-statoverride --update --add nagios www-data 2710 /var/lib/nagios3/rw
sudo dpkg-statoverride --update --add nagios nagios 751 /var/lib/nagios3
sudo /etc/init.d/nagios3 start

And notifications start to flow...