We have a Zimbra CS6 running at our company but since one week I have the impression something goes wrong overnight. Since then, when I arrive every morning people complain that "the mailserver is down". Luckily I found out pretty quick how to solve the problem. But still, this is just temporary!
Mostly, the webmail is still running, but it is not up to date. I believe you do can read the (older) emails.
So the real problem is that the incoming emails are not processed any more.
When I checked the status there is always one or two services not running any more. This time it was the zmmailboxdctl , other times it is the logger, even mta was down once I checked.
For example this morning:
What I do next is
zimbra@zimbramail:/$ zmcontrol status
zmmailboxdctl is not running.
After 10 mins the emails start being sent out to the user's mailboxes.
(mostly randomly, first I receive some emails from around 10am, 2mins later from around 7am etc...)
I have added the file \var\log\messages , I don't know if that is the file needed to do some troubleshooting.
Thanks in advance!