I recently installed Ubuntu 6.10 as a server box for a friend. I installed Zimbra as the mail system, very nice, easy install, and admin ui.

Unfortunately I was perplexed by a number of issues.

1. Cron jobs were not being run
2. When I ran anacron manually it didn’t mail any output.

Well the solution to number 1 was to install cron (apt-get install cron), and add an entry to run anacron periodically.

The solution to number 2 was rather more tricky, and I would not suggest this as a decent solution. What I did was install mailx, this installs postfix, but Zimbra already contains postfix, so I had to make sure postfix did not start automatically (rm -vf /etc/init.d/postfix).

Next I needed the system postfix to see the Zimbra postfix config files,
rm -rf /etc/postfix
ln -nfs /opt/zimbra/postfix/conf /etc/postfix

I think a better solution would have been to configure the system postfix to listen on a different port (eg. 125), and configure it correctly to send mail.