i appreciate your good work! but, without being offensive, i think that you are working a lot on zimbra, and i think that you haven't a lot of time to see if a software have some security bugs... also if you update to every new version
That's one of the basic draws of macs and windows vs linux. Linux can be cumbersome, and not easy for the novice to pick up on.
Zimbra is very self maintaining with logs and cron jobs. With all of the packages bundled together, the zcs team can make sure that everything just works.