[jefft@iri.columbia.edu]

The only system change was the recent Zimbra security fix 30754 which I installed early last week

I checked /var/log/messages, /var/log/maillog, /opt/zimbra/log/mailbox.log in addition to /var/log/zimbra.log and nothing else out of the ordinary except for
> Jul 9 10:18:12 XXXXXX postfix/qmgr[10896]: warning: connect to transport retry: No such file or directory
...
...
> Jul 9 10:34:55 XXXXXX postfix/qmgr[10896]: warning: connect to transport retry: No such file or directory

Which continuously logs during the email outage (probably on every new incoming email until I restart zimbra), which I guess this means that the qmgr is losing its connection to postfix?, and can't recover, but how would this happen?

zmcontrol status returns the all/ok messages (as does the GUI)

The /etc/security/limits.conf file is correct

Any other log files I might check for clues?

Thanks again